Best Boat Trailer Lock

Best Boat Trailer Lock: Buy a Top Quality Locking Option! 10 Reviewed

In this guide, we take a look at the best boat trailer lock options on the market. We look at a wide range of factors, such as ease of use, security, and more. After going through each one, we present our top pick for 2021.

The National Insurance Crime Bureau (NICB) study of more than 900,000 stolen trailers showed that 31 percent were taken with their lock in place. This proves that anyone who wants to steal a boat or utility vehicle needs an effective tool to open these locks. The most common type of lock for this use is the combination padlock.

People who own a boat and trailer will know that it is essential to have the best locks for the safety and security of your property. This article will cover some of the key features to look for in a sound wave and recommend some top-rated locks on the market today.

Table of Contents

What is a boat trailer lock, and how does it work?

The boat you own might be your pride and joy, but what do you do to protect it while out on the water or in storage? Boat trailer locks are essential for protecting this investment.

If you have a small boat that is just sitting in your backyard, these locks are perfect because thieves will not bother trying to break into something they can’t even move. If you have a larger boat, trailer locks will keep the boat attached to the trailer if it is ever stolen.

There are many types of boat trailer locks available on the market today. The kind you choose for your specific application will depend on what type of trailer and where you store it. Several essential locks, including hitch locks, tongue locks, and bow/stern tie-downs.

Best Boat Trailer Lock Reviewed 2021

#1 Master Lock 37KA-3 Trailer Padlocks

Master Lock - (3) Keyed Alike Trailer

It comes as a set of 3 and is manufactured to be heavy-duty, capable of withstanding harsh conditions.


  • A unique dual locking mechanism offers protection from those who wish to break in by prying or cutting the hasp off. It locks with a 4-pin tumbler cylinder.
  • A knurled shackle that offers protection against sawing, prying, and snagging during the application process.
  • 9/32″ hardened solid steel body resists cutting or breaking.
  • Ideal for securing equipment of all kinds, from ATVs to lawnmowers, outboard motors, boats, and more.
  • Offered in multiple sizes to meet your needs.
  • Great for securing yard sheds, equipment, trailers, and other items
  • Comes with 1 brass key that is easy to find in the dark, thanks to an attached metal ring
  • 5 pin tumbler system makes it difficult for anyone without the keys to access your belongings
Positive Side
  • Affordable price at $7.47
  • Heavy-duty stainless steel construction with one-inch wide, case-hardened shackle
  • 5 pin tumbler system makes it difficult for anyone without the keys to access your belongings
  • Comes with 1 brass key that is easy to find in the dark, thanks to an attached metal ring
Negative Side
  • Some customers reported receiving a defective product with broken parts such as shackle and/or case-hardened shackle protection)

#2 AMPLOCK 5 Boat Trailer Lock

AMPLOCK U-BRU2516 Boat Trailer Lock

It is a high-tech boat trailer lock designed to provide peace of mind for anyone who tows their boat. It fits virtually any type and size of U.S. made boat trailer and secures at both the coupler and tongue, which no other security device on the market can guarantee.


  • The trailer attaches and detaches in seconds
  • A patented system of spring-loaded levers and internal locks provides superior strength and security
  • Provides five levels of immobilization: front, rear, and tongue locking devices, one on top of the ball mount, and a protective panel lock
  • A specially designed “stop bar” prevents the trailer from disconnecting when in the locked position
  • Hardened-steel bars won’t bend, break, or saw through
  • made of high strength aircraft aluminum, 1/8″ thick
  • ring seal for water resistance
  • 1″ diameter stainless steel locking pin with a detachable Keylock, able to handle up to 452ft-lbs of force while locked
Positive Side
  • This is ideal for demanding security applications such as trailering boats to boat launches, marinas, and storage yards. The 5 levels of immobilization provide superior strength and security against theft.
  • It attaches and detaches in seconds for convenience when using multiple vehicles or switching trailers.
  • A patented system of spring-loaded levers and internal locks provides superior strength and security against theft.
  • Comes with 1 brass key that is easy to find in the dark, thanks to an attached metal ring
  • Provides five levels of immobilization: front, rear, and tongue locking devices, one on top of the ball mount, and a protective panel lock.
  • Provides five levels of immobilization: front, rear, and tongue locking devices, one on top of the ball mount, and a protective panel lock.
Negative Side
  • The design of this is such that it must be used on trailers with square tubing for the tongue and ball mounts; if your trailer has round tubing, you will likely need to have the manufacturer cut off the round tubing for this product to fit correctly.

#3 Master Lock 379ATPY Universal Trailer Hitch Lock

Master Lock 379ATPY Universal Trailer Hitch Lock

It is an excellent fondness for anyone who owns or rents out an R.V., trailer, or boat that needs to be secured.

This allows the user to have peace of mind that their belongings are secure and protected from theft without having to worry about them being easily accessible by people who would only use the items for their own benefit.


·    Fits 2″ receivers, with a pin diameter of 0.5″- 0.625″.

·    Resettable 4-digit code is user selectable

·    Durable stainless steel construction

·    Rustproof

Key selling points:

·    firmly locks into place with an included hitch pin

·    protects against theft of trailer and hitch


·    The lock is durable and can be used in a variety of different places.

·    The lock has high security due to the 4-digit combination that you have to enter before it unlocks.

·    The stainless steel protects from rust and other elements.


·    It may not fit certain types of receivers because it requires a minimum of 0.5″ pin diameter to work.

·    It may become damaged by weather since it’s not waterproof/resistant

Also Read : Top Rated Boat Seat Pedestal

#4 Shoreline Marine Trailer Coupler Lock

Shoreline Marine Trailer Coupler Lock

It is ideal for boat trailers. The coupler lock’s rotating head telescopes from 5 inches to 7-1/2 inches, making it versatile for various applications.


·    The U.S. made of steel and aluminum

·    Keyed lock for added security

·    Protects against theft, loss of the boat, and trailer damage

·    Easy to attach and quick release feature upon turning the key

Key selling points:

·    Quality – it is made of steel and aluminum; it has a keyed lock for extra security and protects against theft, loss of the boat, and trailer damage.

·    Unique dual function – the product can be used as a double lock for boats and trailers.


·    High-quality locks

·    Made in the USA

·    Unique design that protects against theft.

·    It can be used as a dual lock for boats and trailers


·    It might be hard to attach at first

·    Its key is minor, so it can easily get lost or misplaced if not put in a safe place.

#5 Master Lock 389DAT Trailer Lock

Master Lock - Universal Size

The 389DAT provides the most basic security for trailers. The steel cable is weak compared to other locks available.

The design of the lock itself makes it easy to cut with bolt cutters. It would take a thief more petite than a minute to steal your trailer.


·    Designed for medium duty-trailers

·    Resettable combination lock system with 4,000 possible combinations

·    14.5 in a long shackle

Key selling points:

·    The product has a resettable combination lock system with 4,000 possible combinations.One of the best Best trailer coupler lock in the market.


·    The products price is very affordable at only USD 9.99 on Amazon

·    This product has a resettable combination lock system making it harder for thieves to open and steal your trailer or boat

·    The shackle is 14.5 in long, so thieves will have a hard time breaking this lock


·    This product is not waterproof, so you should avoid leaving it outside for long periods

·    The shackle does not open to 180 degrees—this means that if your trailer or boat has a thicker piece of metal on the door, this lock may be harder to attach.

·    The shackle does not open to 180 degrees—this means that if your trailer or boat has a thicker piece of metal on the door, this lock may be harder to attach.

#6 Trimax UMAX100 Trailer Lock

Trimax UMAX100 Premium

It is a heavy-duty, weatherproof lock for securing your trailer. The hardened steel shackle provides maximum torque resistance against bolt cutter attacks, and the one-piece body can not be separated with standard tools.


·    Universal fit for all standard sized Ballmounts

    Made from heavy-duty stainless steel

·    Anti Dust cap included protecting dust, dirt, and moisture from entering the lock cylinder

Key selling points:


·    Keyless locks for convenience of not having to carry around a key

·    Universal fit for all standard-sized ball mounts.

·    Convenient anti-dust cap included protecting dust, dirt, and moisture from entering the lock cylinder.


·    Does not include a fob or key for programming

·    May not fit specific manufacturer’s ball mount

#7 Tow Ready 63228 Gorilla Guard Coupler Lock

Tow Ready (63228) 'Gorilla Guard' Coupler Lock

A coupler lock that attaches your trailer’s ball mount to the hitch. This technology prevents thieves from stealing your entire trailer when only taking the coupler.


·    A black powder coat finish provides corrosion resistance to keep your coupler looking new for years.

·    This internal design is proven much more substantial than other locks on the market. It outperforms the competition in torsional strength, shear strength, and sideloads tests.

·    The Gorilla Guard can be fitted to all types of couplers, even those with top or bottom release levers.

·    It features a “Smart Key” system that automatically adjusts to the proper tension—and cannot be defeated without factory-style keys.

·    A free spacer is included to accommodate top or bottom release levers found on some couplers.

Key Selling Points:

·    The black powder coat finish provides durability and corrosion resistance, while its intelligent key system ensures that you never get locked out.


·    Provides a high level of security to your hitch coupler

·    Has a one-year replacement warranty in the event of damage

·    Can fit on all types of couplers, including those with top or bottom release levers


·    Slight increase in costs compared to non-locking coupler locks

·    More difficult installation process than other locking coupler locks.

#8 Reese Towpower 72783 Universal Coupler Lock

REESE Towpower 72783 Coupler Lock

The lock is a product that offers easy and adequate security for your ball mount. This lock fits 2-inch hitch mounts and locks into place with a key.

You can even attach it to an anchor or chain for additional security.


·    Heavy-duty lock guards against theft of coupler and trailer

·    Locking mechanism for enhanced stability

·    The cable is 13mm (1/2″) in diameter

·    Product Dimensions: 3.5″ x 3″ x 7.75″.”.


·    Keeps your coupler locked in place

·    Padlock includes two keys for unlocking the coupler, one key for locking it.


·    Need to attach and remove the cable to secure or release it from tow vehicle and trailer each day

·    If not correctly aligned, the cable can come loose

#9 Proven Industries Lock Model #2178

Proven Industries Lock Model #2178 for 2" Coupler | RV/Trailer

A medium-security lock does not require keys for locking and unlocking.


·    It is a heavy-duty, high-strength padlock that provides excellent security at an affordable price.

·    This shackle-less lock has no exposed parts or sharp edges to protect against twisting and cutting attacks.

·    Ideal for use with chain-link fences, livestock enclosures, toolboxes/storage containers, trailers, plant facilities, and more.

Key Selling Points:

·    High strength steel construction with a 1/8″ case hardened boron alloy shackle provides the highest level of protection from cutting and sawing.

·    The shackles design contains no exposed sharp edges to protect against twisting or cut attacks. A non-conductive coating provides protection from electrical attacks.

·    Ideal for use in various applications, including livestock enclosures, toolboxes/storage containers, trailers, and more.


·    Solid – the most robust lock on the market.

·    High quality – made of high-strength steel with a case hardened boron alloy shackle as strong as they come.

·    Affordable – if you are looking for the highest level of protection without breaking the bank, this is your lock.


·    It may be too hefty for some users.

·    The ends of the shackle stick out past the case-hardened boron alloy shell making it more susceptible to cutting attacks.

#10 Goplus Heavy Duty Trailer Lock Wheel Clamp

Goplus Heavy Duty Trailer Lock

It’s a two-way padlock for which the spare key can be kept separately. It has anti-scratch zinc alloy material to make it last longer.

The product can protect your trailer against theft and vandalism by securing the wheels much more accessible than other products on the market.

The ock makes a chirping noise when you use this product


·    Reinforced steel forms a secure lock around your wheel

·    Quick-release button for fast removal

·    Pull ring provides easy access when needed but still keeps the wheel safe


·    Easy to install and use. No tools are required.

·    A pull string is used to tighten the clamp so that the wheel is securely locked.

·    Four sets of teeth act as serrated grips to ensure that no one can steal your wheel.

·    It has an anti-squeak feature, so if someone tries to engage your brakes, it will make noise without actually engaging them, alerting you and allowing you to take further action.

·    The wheel clamp is sturdy and made of high-quality material, which will last for a long time.


·    The wheel clamp weighs 5 pounds and is bulky and heavy, making it difficult to store or carry with you on your person in some vehicles.

·    It is not designed for use on low profile tires, so if your car has thin wheels, this will not fit under it

·    The wheel clamp does not include its own anti-theft wrench, so you must provide your own.

Types of boat trailer locks

There are many different types of boat trailer locks to choose from, but they all pretty much do the same thing.

When you go boating, your boat will be sitting in the water and attached to a boat trailer. If someone has a key for this boat trailer lock, they can come along and unhook your boat and take it away.

Actually, even if they don’t have a key for this kind of boat trailer lock, all they need is a good set of bolt cutters to get the job done. A brief rundown on three types of boat trailer locks:

The Master lock (or similar) is a cable lock with a combination on it. With this type of boat trailer lock, you open the cable, put the cord around your boat or between your boat and trailer, and then close the line again. You can get this type of boat trailer lock-in 3/16″, 1/4″, and 5/16″.

Cable seal

It is the type that you actually have to put around your boat. It works because the wire goes through two holes on one side and then comes out to another spot on the other side.

You close this wire, so there is no way for anyone to get in between the wire. This type of boat trailer lock is recommended if you leave your boat unattended for long periods, like overnight.

Steel cable

It wraps around your propeller and then attaches to another piece of steel cable (that goes around the boat). With this kind of boat trailer lock, you can leave your boat unattended for extended periods.

No matter what type of boat trailer lock you have, it is recommended that you use both types if possible. And remember to keep your keys safe!

Benefits Of Using A Boat Trailer Lock

1) Protection against theft – It provides security against thieves who would like nothing better than to steal your vessel without you knowing.

2) Prevents tampering – It prevents boat thieves from opening the lock and tampering with your vessel’s electrical cables or other vital equipment.

3) Protection against vandalism – A boat trailer lock serves as a protective measure against people who want to do harm to your property through destruction.

4) Hardship during transportation – The security of your boat is essential to you, and with a boat trailer lock, you can rest easy knowing that it will be safe during transportation.

Buyer’s Guide-Boat Trailer Locks

Trailers are a vital part of a boat. Without a trailer, getting your boat from one place to the other would be more of a hassle. That is why you must have a proper lock on your trailer so that no one can steal it. To avoid this, buying the right kind of lock is necessary. If you are planning to buy a trailer lock, then you should consider the following factors:

1) Type of Lock Used

There are many types of locks for trailers available in the market. But if you want to be sure about the security of your boat, invest in an unbreakable one. The unbreakable locks are made of cast aluminum and stainless steel. They prove to be the best type of locks, especially if you own an expensive boat.

2) Key or Combination Lock

Do you want a key-type lock or combination-type lock for your trailer? If you choose a key-type one, then there is no need for you to memorize a combination. However, if you select the combination-type lock, the chances of your boat being stolen are less because of the formidable combinations that need to be deciphered.

3) Size of Lock

The size of your trailer will help you decide the size of the lock that you should get.

Small or too big might not be fit for your boat. It rests on what you want to use it for. For example, if you use it as an additional security measure, a more colossal lock will do the job well.

4) Warranty

A warranty provided by the manufacturer on your lock is also a factor that you should consider. This ensures that your latch will be secured for a certain period, even if it breaks down shortly after the purchase.

5) Ease of Use

The lock should not be a hassle to use every day, especially when you want to secure your boat before going to bed at night.

Care and Maintenance of Boat Trailer Locks

Boat trailers and boat tow vehicles, like all vehicles and tow vehicles, need to be cared for and maintained to keep them looking nice and to ensure their safety.

Boat trailer locks are an essential part of the relevant systems – they provide security for the boats on the back of the boat trailer and guard any devices attached to the boat trailer.

Has the lock has been exposed to saltwater? Saltwater can cause rust on metal parts, including metal pins and springs within a boat trailer lock, so it must be cleaned off immediately.

Once the saltwater has been removed, the metal parts of the lock should be lubricated with grease or oil to prevent further rusting.

Another thing to consider when caring for boat trailer locks is whether any signs of corrosion are visible on the pins and springs within a boat trailer lock.

Corrosion can be patched up by applying grease or oil to the affected area.

Also, make sure that no pins are bent; if any pins are bent, be sure to take your boat trailer lock-in for servicing.

Ensure the anti-theft device has been attached to the back of the boat trailer.

Many owners choose to attach this type of device to deter theft, but it can also be helpful if the lock is not functioning correctly.

Whatever kind of lock is used, anti-theft devices should be checked every few months if they need to be serviced or replaced.

Frequently Asked Questions

To use a boat trailer safely on water, what should be done?

The wheels should be chocked, and they should have been inspected by an authorized person. As well, it is necessary to have a spare tire, winch, and jack.

Which type of locks are better: pin or disc, and why?

Pin locks are more difficult to pick and typically require a special tool called a lock pick set. Disc locks can be picked with a variety of different tools, including the screwdriver, paperclip, and sometimes even household items like toothpicks or pencils.

The reason for this is that pin locks have individual pins that must be manipulated in order to manipulate the tumblers on the lock cylinder to make it easier for someone else to open your door. In contrast, disc locks use one large keyhole where all the pins are placed in one central position.

What are the legal requirements in my country for boat trailers?

The legal requirements in most countries are that you should have a fire extinguisher, tool kit with tools adequate for changing an inner tube in case of deflation in a tire. Also, you should have a spare tire, winch, and jack.

Which one is better: external trailer lock or internal trailer lock, and why?

Both are acceptable, although an external trailer lock may be easier to break into than an internal one. However, in most cases it is unlikely that someone would risk stealing a trailer for something like this; you’re more likely to get broken windows or drive headers if the thief tries anything inside your home. The purpose of locks on boats and trailers is not necessarily theft prevention (a pin lock can also prevent entry by anchoring the boat

How do I know if my boat trailer lock is secure enough to tow my boat with it?

The first thing you need to do is ensure that the trailer has been locked with a proper lock.

If the trailer is locked, you should be able to see a thick, solid metal cable that is locked around your boat’s hitch. The locking mechanism should also have two separate parts that are attached together with a small clip or pin which secures the cable into place.

Where can I find the regulations of my country?

It is possible to find their regulations on the web page of your national car association. Also, it is possible to ask your regional or local police office for more information.

What do choking wheels mean?

It means that chocks are placed in the front and back of your boat trailer tires to prevent them from moving. Chocking systems can be made by using wood blocks or screw jacks.

What is a winch?

It is a device with a drum, gear, and handle to tighten or loosen heavy ropes.

What is a jack?

A jack is a mechanical device, usually hydraulic, for lifting an object through a screw thread or worm drive. It may also be known as a screw jack or bottle jack.


There are many different types of boat trailer locks, and it can be challenging to choose which one is right for your needs. We’ve done all the investigation so that you don’t have to! Our guide will help you find the perfect lock for your boat.

You want a lock that provides security without being too bulky or heavy. You also want something durable and easy to use – no matter what kind of weather conditions you might encounter on the water.

With our recommendations, we ensure that whatever type of lock you choose will provide maximum protection against theft while still keeping your load safe from harm during transport. It’s never been easier to find a great product at an affordable price point!

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