ProCarReviews is reader-supported. We may earn commission on sales through our links at no extra cost to you. View policies.

The Best Trailer Hitch Lock 2021

best trailer hitch lock

Using a trailer hitch lock is the best way to keep your trailer secure from thieves looking for a quick getaway. They are designed to withstand heavy hammer blows, lock picking and other methods of removing it without the key. In terms of compatibility, you can purchase a trailer hitch in a variety of sizes or shapes. Therefore, it’s crucial that you buy a compatible trailer hitch lock as many brands offer sizes to suit multiple trailer couplers.

If require a quick answer, the best best trailer hitch lock is the AMPLOCK U-BRP2516, which is constructed of heavy duty stainless steel and ducted cast iron. However, if you are on a tight budget, the Tow Ready Gorilla Guard is the best alternative that can withstand heavy impact hammer blows.

In terms of rating the trailer hitch locks, we based them upon our experience and many factors. As you can see in the above image, that’s our Proven Industries lock that we use upon our boat trailer but we have previously used many other locks. The factors that we also considered include their construction, weight (as its an indication of the build quality), locking mechanism, compatibility and value for money.

Table of Contents

Trailer Hitch Lock Comparison

Coupler LockConstructionWeight
AMPLOCK U-BRP2516All Steel12.0 LBS
Proven Industries LockAll Steel10.1 LBS
Tow Ready Gorilla GuardSteel & Rubber2.2 LBS
Master Lock 377KAAll Steel2.2 LBS
Trimax UMAX100Steel & Nylon4.6 LBS
Blaylock TL-33Aluminum4.1 LBS
Master Lock 389DATAll Steel2.6 LBS
REESE TowpowerAluminum & Steel1.0 LBS
Master Lock 1469DATStainless Steel0.7 LBS
TowWorks 79632All Steel2.44 LBS

There is a trailer lock suited for each budget with many cheap and premium options available. As you can imagine, the majority of cheap trailer locks are going to be easy to break and simply act as a deterrent. Therefore, depending upon how expensive your trailer load is should reflect upon your buying decision.

Considering that the price of common trailer loads such as RV’s, jet-skis, ATV’s and other assets can cost thousands, its worth spending the extra for superior quality.

Below is a list of the best trailer hitch locks that fit a range of couplers and protect your trailer from being stolen.

The Best Trailer Lock

1. AMPLOCK U-BRP2516 Trailer Coupler Lock

AMPLOCK U-BRP2516 Trailer Coupler LockThe AMPLOCK U-BRP2516 is a premium trailer hitch lock that provides maximum protection and is easy to use. It’s constructed of stainless steel and ducted cast iron, which weighs a total of 12 LBS. According to the brand, it also has millions of key combinations and each lock comes with a unique code.

Other features of the AMPLOCK U-BRP2516 include:

  • Molded to fit the specific shape of your coupler
  • Fits 2 5/16 inches couplers
  • Cylinder lock mechanism makes it harder for criminals
  • Swivel design
  • Rotating face prevents drilling
  • Corrosion resistant
  • Unpickable lock
  • Option to have multiple keys

Overall, the AMPLOCK U-BRP2516 is a high quality American made trailer lock that will provide you with peace of mind that your trailer is secure. It does come at a cost but if your trailer and the cargo on it are worth thousands, it’s a worthwhile investment.

Check it Out

2. Proven Industries Trailer Hitch Lock

Proven Industries Trailer Hitch LockIf you after the ultimate protection for your trailer and there is no strict budget, the Proven Industries hitch lock is the answer. It’s bolt cutter proof and is one of the best trailer hitch locks available for the money.

Unlike many of the alternatives, this hitch lock also secures the safety chains of the trailer for extra security.

Other features of the Proven Industries 2178 include:

  • 1/4 inch thick all steel construction
  • Various sizes available
  • Easy installation
  • Blue, orange or red color options
  • Made in USA
  • Lifetime warranty on the outer casing

The Proven Industries 2178 lock is a premium option that’s designed to provide the best possible protection. The brand states that it provides a “glove like” fit and it will fit the majority of couplers on the market.

Check it Out

3. Tow Ready Gorilla Guard Coupler Lock

Tow Ready Gorilla Guard Coupler Lock
Compared against other trailer locks, the Tow Ready’s Gorilla Guard sits more to the front of the hitch. This has the benefit of shielding the lock against any tampering devices and it can also withstand any impact damage all day long. To ensure this trailer lock is compatible, it’s width cannot exceed 3-13/16 inches and the height must not be greater than 5/16 inch.

Other features of the of the Tow Ready Gorilla Guard include:

  • Compatible with most 2 inch couplers
  • Wide design that withstands heavy impact hammer blows
  • Simply slides onto the coupler
  • Weather resistant
  • Includes two keys
  • One year limited warranty

Overall, it’s an excellent all-round trailer coupler lock that offers great value for money and effectively stops most attacks. The only drawback is the fact that it lacks compatibility with other coupler sizes.

Check it Out

4. Master Lock 377KA Trailer Hitch Lock

Master Lock 377KA Trailer Hitch LockThe Master Lock 377KA is a chrome plated coupler lock that comes with two keys and is one of the most popular on the market. It’s also available in two different sizes ranging from 1-7/8-inch (51 mm) to 2-5/16 inch (59 mm). The lock itself is a shackle, which means picking the lock is much harder than other locks.

Other features of the Master Lock 377KA include:

  • Galvanized construction
  • Curved design makes it harder to hit
  • Advanced locking mechanism
  • Includes two keys
  • Limited lifetime warranty

Overall, the Master Lock 377KA is a cheap trailer hitch lock that provides heavy duty protection. For this reason, it’s one of the most popular locks available and it has the added benefit of being compatible with multiple coupler sizes too.

Check it Out

5. Trimax UMAX100 Trailer Hitch Lock

Trimax UMAX100 Trailer Hitch Lock
The Trimax UMAX100 is another popular trailer lock that uses an exclusive design to provide 360 degrees of protection. The construction is made from a combination of  hardened steel and a ballistic grade nylon housing for maximum durability.

This lock is available as a single universal coupler lock that’s designed to fit all types from 1-7/8, 2, and 2-5/15 inch.

Other features of the Trimax UMAX100 include:

  • Dual ratchet lock system
  • Key hole cover to keep out dirt
  • Universal design
  • Solid hardened steel construction
  • Two keys included

The brand claims that it’s the “worlds toughest lock” and with the heavy duty construction, it’s a strong contender. Overall, the UMAX100 lock won’t disappoint and will make the criminals task of removing it virtually impossible.

Check it Out

6. Blaylock TL-33 Coupler Lock

Blaylock TL-33 Coupler Lock
The Blaylock TL-33 is a heavy duty trailer lock that’s made in the USA and constructed of the highest grade aircraft aluminum. It has a durable design that’s resistant to corrosion and can withstand the toughest of environments.

The brand state that it’s compatible with over 30 different coupler style brands and fits 2 and 2 5/16 inch couplers.

Other features of the Blaylock TL-33 include:

  • 3 hole positions for multiple couplers
  • Heavy duty aluminum construction
  • Fits most coupler styles
  • Weighs 4.1 LBS
  • Made in the USA

Considering the low price tag of the Blaylock TL-33, it’s by far the most rugged available for the money. The aluminum construction is durable and has the added benefit of not rusting and being able to withstand heavy duty usage.

Check it Out

7. Master Lock 389DAT Coupler Lock

Master Lock 389DAT Coupler Lock
The Master Lock trailer coupler lock is another popular option that’s compatible with most couplers. The brand have ensured that it’s highly visible by powder coating the construction in a bright red finish, which acts as a deterrent to criminals.

Although it’s a cheap trailer hitch lock, it still comes with premium features such as a key lock cover and a pick resistant locking mechanism.

Other features of the Master Lock 389DAT include:

  • Fits 1-7/8″, 2″ and 2-5/16 couplers
  • Corrosion resistant
  • Easy to install and remove
  • Advanced locking mechanism
  • Includes two keys
  • Bright red finish

This particular trailer coupler lock by the Master Lock brand is perfect for those on a budget and need a highly visible secure lock. The 389DAT model will not disappoint and it offers the best value for money when compared to the alternatives.

Check it Out

8. Reese Towpower 72783 Trailer Lock

Reese Towpower 72783 Trailer Lock

The Reese Towpower tow hitch lock is a more affordable option for those that are looking for trailer security. It’s a bright yellow design, which acts as a highly visible deterrent that puts off potential criminals straightaway.

The design of this trailer hitch lock is fairly simple and very easy to install with the adjustable loop. The way to release the locking clamp is by simply turning to key clockwise, holding it in that position and then pulling the clamp upwards.

Other features of the Reese Towpower include:

  • Compatible with 1-7/8 inch, 2 inch and 2-5/16 inch couplers
  • Adjustable loop makes installation easy
  • Heavy duty steel lock bar
  • Aluminum body
  • Ratchet design with 11 locking positions

To conclude, it’s a cheap trailer hitch lock but this does mean the durability can suffer. For example, it is possible to hammer the aluminum body to pieces with a hammer. This is a cause for concern but if you have a cheap trailer with a budget lock such as this model, it will act as an excellent deterrent.

Check it Out

9. Master Lock 1469DAT Receiver Lock

Master Lock 1469DAT Receiver Lock
An alternative trailer hitch lock by the Master Lock brand is the 1469DAT model. It’s constructed of a heavy duty stainless steel, which is weatherproof and designed to withstand the toughest of environments.

In terms of using this receiver lock, it simply pushes together onto the pin, which you can then lock and remove the key.

Other features of the Master Lock 1469DAT include:

  • Hardened receiver locking hitch pin
  • Suitable for 5/8 inch receiver holes
  • Withstands all weather conditions
  • Brass keyway with aluminum casing
  • Swivel head that rotates 360 degrees for easy access
  • Fits 2 and 2 1/2 inch hitches
  • Extended length shafts
  • Includes two keys
  • Limited lifetime warranty

The brand also offer various configurations of this lock, which is available in stainless steel or chrome and a length of 2.75 or 3 inches.

Although it’s not a similar design to the other trailer hitch locks, it’s certainly an easy to use option that fits most standard receivers. It’s an excellent all-round receiver lock that deters any thieves from walking away with your hitch or cargo.

Check it Out

10. TowWorks 79632 Trailer Hitch Locking Pin Set

TowWorks 79632 Trailer Hitch Locking Pin Set
Another highly rated receiver lock is by the TowWorks brand and it’s designed to fit hitches with 2 and 2.5 inch receivers. Unlike the Master Lock alternative above, it does come with a premium price tag but it’s worth the added cost for the many added extras.

In order to maximize the performance, these receiver locks come with separate spring clips and rubber o-rings to prevent rattles whilst driving.

Other features of the TowWorks 79632 include:

  • Extra long pin
  • Two tubular keys
  • Push lock design for ease of use
  • Heavy duty for class V hitches
  • Black powder coated to prevent corrosion
  • Solid hardened steel construction
  • Thoroughly tested within US labs
  • One piece solid steel design

The TowWorks 79632 locking pin set is a high quality receiver lock that won’t disappoint. It’s designed to fit an array of hitches with multiple models available to best suit your requirements. However, it’s worth noting that these locks will not work with CURT channel style adjustable ball mounts.

Check it Out

How We Rated The Hitch Locks

As mentioned above, we have used multiple trailer hitch locks but recently took the plunge and purchased the premium Proven Industries lock. Therefore, in terms of rating the trailer hitch locks, we rated them from our experience of using multiple locks as well as various factors. These factors included their construction, weight (as its an indication of the build quality), locking mechanism, compatibility and value for money.

Trailer Hitch Locks Buying Guide

When it comes to protecting your trailer, it’s important that you invest wisely into a trailer hitch lock. The trailer and the cargo on the trailer can cost thousands of dollars and without protection, it can be stolen in minutes.

90% of the time, a cheap trailer lock will act as a deterrent and put those criminals off. This is because they will be looking for an easy target. However, if your trailer load is expensive but is still using a weak lock, then it may be worth the criminals time and effort hammering it off. Therefore, within our recommendations we have mentioned premium alternatives that are virtually impossible to take off without the key.

To help you make an informed buying decision, we have produced the below guide regarding trailer hitch locks.

best trailer lock

How Easy Is It To Steal A Trailer?

The ease to which you give the thieves the opportunity to steal your trailer is up to you. For example, if you leave your towable possession (lets say a boat on a trailer) on your driveway with nothing attached to it, you are asking for trouble.

Another example is if you are towing with your vehicle and you stop for a period of time. A criminal may pounce when you aren’t looking. If you haven’t installed a trailer hitch lock, they can simply pull up, disconnect it from your vehicle and put it on their car.

Even those with a hitch for a fifth wheel trailer, a determined criminal will be able to get past the jaw mechanism and take your trailer with them. The same can be said with a more complicated setup such as a hitch using a weight distribution system.

Build Quality

As you can imagine, the first thing a criminal will try is to use brute force to remove your lock. For example, constantly hitting the trailer lock with a hammer until it falls apart. If the body is made from an aluminum or zinc material, this may eventually fall apart through the heavy impacts.

Look out for heavy duty steel throughout the construction (such as the Proven Industries lock), which will be able to withstand heavy impact damage all day long.

best trailer coupler lock

Key Combinations

When it comes to the popularity and low cost examples, the uniqueness of the keys can become an issue. For example, a criminal may have a selection of keys available to them and it’s a matter of trial or error that may result in a match.

Brands that mention that they have thousands or millions of key combinations are highly recommended. However, if you do choose a lock like this, you want to ensure you keep the packaging or note down the unique code of your key because you may be in trouble if you ever lose it.

Flaws with Cheap Locks

With trailer hitch locks, you really do get what you pay for. The cheaper alternatives will always be easier to unlock than the more expensive coupler locks.

One of the most popular locks in the USA (Reese Towpower) has been known to break easily if you hit the aluminum body with a hammer a few times. However, it gets worse as you can see in this video because it demonstrates the effectiveness of the Proven Industries lock when compared to cheaper alternatives.

With that being said, it still acts as an excellent deterrent to those looking for a trailer that’s quick and easy to steal. It remains within our recommendations primarily for that reason alone and it does hold some security values for your trailer whilst also being cheap.

Hitch Size

Not all trailer hitch locks are universal and some will only fit common hitch sizes. The most common is either 2 or 2 5/16 inch couplers but its crucial that you check the size of your hitch before purchasing.

On top of the hitch size, be sure to check that the design of the lock you choose will not get in the way. You will want it to be securely locked in position without it having to be adjusted to avoid other objects.

best trailer tongue lock

Additional Methods To Prevent Theft

Making the thieves job harder in the first place will results in them avoiding your trailer. Preventive methods to avoid trailer theft include:

  • Parking in open areas if in public area
  • Invest into a good trailer wheel lock
  • Park near large objects if remote to make it harder
  • Paint or leave distinctive marking on trailer
  • Invest in tow hitch locks
  • Install a GPS tracking device

Above are just 6 ways to prevent the theft of your trailer. Some owners may also extend their aftermarket car alarm to also protect the trailer. However, the main steps listed will almost certainly make thieves think twice before attempting to steal your trailer.


Using a coupler lock to secure your trailer with an expensive load on is a worthwhile investment. The coupler lock that you choose is dependent upon your budget but even with the cheapest coupler lock installed, it will act as a deterrent to put anyone off stealing your trailer. Most criminals will just want to hitch it up and make their getaway.

All of our recommendations will secure your trailer and put off any criminal. If the load on your trailer is expensive, this should reflect the price of the hitch lock you purchase.

procarreviews author

Written By Dan

About the Author

Dan is an automotive journalist and owner of over 10 cars ranging from supercars, tuned cars, classics and your good old beater cars. He always likes to get his hands dirty with nut and bolt restorations or detailing sessions using the best products on the market.

More About Our Team →


Copyright © 2024. All rights reserved.