The 5 Best Trailer Hitch Locks – [2021 Reviews]

Don't lose your trailer to opportunist thieves, we break down this year's top trailer hitch locks

Our Editors independently research, test, and rate what we feel are the best products. We use affiliate links and may receive a small commission on purchases.

Read the pros/cons of the 5 best trailer hitch locks ranging from ball hitch locks to trailer lock sets. After the reviews there is an in-depth buyer’s guide, How To Choose The Best Trailer Hitch Locks, and some frequently asked questions (FAQs).

Best Trailer Hitch Locks

 Trimax UMAX100 Trailer LockReese Towpower Lock KitMaster Lock - Hitch Lock
editors choice

Lock SystemDual ratchet lock System
Lockable offering extra safety
Universal coupler lock fits
InstallationEasy to Install
Easy to install
Simple installation and removal
Special Features½ Turn Technology, 360 Degree Protection

Easy To Tow, Includes a swivel clip

Key Entry Covered, Won’t Rust or Corrode

Customer Ratings4.0 / 5.0 Stars4.0 / 5.0 Stars4.5 / 5.0 Stars

Also see: Best Trailer Hitch Locks Comparison Table

Quick Answer: The 5 Best Trailer Hitch Locks

  1. Trimax UMAX100 Premium Universal ‘Solid Hardened Steel’ Trailer Lock
  2. Reese Towpower 7014700 Tow ‘N Store Lock Kit
  3. Master Lock – Universal Size Trailer Hitch Lock
  4. Master Lock 377KA Trailer Hitch Lock
  5. TowWorks 5/8″ Trailer Hitch Locking Pin – Black Tow Hitch Receiver Lock

Best Trailer Hitch Locks Reviews

#1 – Trimax UMAX100 Premium Universal ‘Solid Hardened Steel’ Trailer Lock

best trailer hitch lock editors choice

Trimax UMAX100 Premium Universal Trailer Lock At A Glance:

  • ½ Turn Technology
  • Easy to Install
  • One Size Fits Most
  • 360 Degree Protection
  • Keyhole is Covered
If you’re looking for a trailer hitch lock with 360 degrees of protection, the Trimax UMAX100 has just that.

No matter what you’re towing, whether a camper, a brand new boat or a trusty old trailer, it will be protected even when it’s not on your vehicle. The lock cannot be falsely locked and has a massive 6 toothed locking system.

This lock is durable so you can rest assured if you’re leaving your vehicle with a trailer on it at a hotel overnight, that no one can break it off.

Being durable also means you won’t have to worry when you hit bumps or potholes in the road. The keyhole has a cover to keep out dirt and grime.

Trimax-UMAX100-Universal-Hardened-couplers hitch body 1Trimax-UMAX100-Universal-Hardened-couplers hitch body 2

If you want even more security, you can add a cable or chain to an anchor point from whatever you’re towing. It can easily be removed by using the key and sliding the trailer lock down.

It universally fits just about anything that can be hitched onto a vehicle but is especially great for travel trailers like campers and RV’s.

One of the best things about the Trimax brand is that they offer lifetime warranties on everything they sell.

#2 – Reese Towpower 7014700 Tow ‘N Store Lock Kit

Reese Towpower 7014700 Tow ‘N Store Lock Kit At A Glance:

  • Easy To Tow
  • Budget Friendly
  • Includes a swivel clip
  • Simple to Install
  • Lockable
Getting a lock kit is one of the best ways to lock a trailer. The coupler lock is universal and can keep whatever you’re towing safe and sound, even when you’re nowhere near it.

The brass coupler lock is adjustable and made out of steel, making it hard for anyone to break off or into.

A lot of people like this trailer tongue lock because of the dual bent pins that let ball mount get locked onto the hitch. You get two keys when you buy this trailer ball lock, which can give you peace of mind incase one of them gets lost somewhere.

If you live in California, please look at Prop 65 before purchasing Reese hitch locks.

#3 – Master Lock – Universal Size Trailer Hitch Lock

Master Lock – Universal Size Trailer Hitch Lock At A Glance:

  • Fits all 1-7/8″, 2″ and 2-5/16″ couplers
  • Limited lifetime warranty
  • Key Entry Covered
  • Bright Red in Color
  • Won’t Rust or Corrode
If you’re wanting a trailer hitch lock that is long lasting and made by a company known for their locks, the Master Lock Universal Size Trailer Hitch Lock may be for you.

This trailer coupler lock is one of the best master trailer locks on the market. It’s incredible simple to install.

With this lock you don’t have to worry about it rusting or corroding away from dirt or snow. The key entry is protected so that grime and gunk can’t get inside.

A unique thing about this lock is the fact that Master Lock made it bright red. This color psychologically deters thieves.

Master-Lock-Universal-Couplers-Trailer body

The locking system has mechanisms in place that won’t allow people to break in by picking or prying at the lock. No two of these locks are keyed the same so you won’t have to worry about someone with the same lock breaking into your trailer.

#4 – Master Lock 377KA Trailer Hitch Lock

Master Lock 377KA Trailer Hitch Lock At A Glance:

  • Fits all 1-⅞ inch and 2 inch trailer couples along with most 2 5/16 inch couple trailers.
  • Simple to Install
  • Keyed Alike
  • Rust and Corroding Resistant
  • Easy to Remove with Key
Another Master Lock product to make the list is the 377KA trailer hitch lock. This is one of the best trailer locks on the market that won’t cost you an arm and a leg. This lock works best on trailers, RV’s and vehicles.

One of the best thing about Master Lock products is that they all come with limited lifetime warranties so if it breaks or isn’t up to your standard, there is a timeframe where you can return it or get replacement parts.

They’re also equipped with advanced locking mechanisms that won’t allow anyone to try to pry the lock off or pick the keyhole.

It’s made out of zinc which is how the lock is able to stop from rusting and corroding when left out for long periods of time in extreme weather.

#5 – TowWorks 5/8″ Trailer Hitch Locking Pin – Black Tow Hitch Receiver Lock

TowWorks 5/8″ Trailer Hitch Lock At A Glance:

  • Spring Clip
  • Push Lock Design
  • O Rings Included
With class V towing, you’ll be able to tow a maximum of 20,000 pounds with the TowWorks ⅝ Trailer Hitch Locking Pin! Made from hardened steel and e-coated with blank paint, this king pin lock looks as slick as it performs.

It has extra long pins that can fit larger hitches. With or without the pin you can use the extra safety feature of the spring clip that locks without the pin.

If you’re wanting a lock that is quiet, this TowWorks one has rubber o rings that keep the hitch pin from moving and stops any rattling before it starts.

TowWorks-Trailer-Hitch-Locking body


There is a rubber cap over the keyhole that is watertight and prevents any dirt or grime to get inside. Since it is a barrel lock, it’s already hard to pick than most other types of locks out there.

Lastly, it comes with a lanyard so it can be kept in a safe place without getting lost when it’s not being used.

Best Trailer Hitch Locks Comparison Table

  Lock SystemInstallationSpecial FeaturesCustomer Ratings
Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer LockDual ratchet lock System
Easy to Install
½ Turn Technology, 360 Degree Protection
4.0 / 5.0 Stars
Reese Towpower 7014700 Tow 'N Store Lock KitLockable offering extra safety
Easy to install
Easy To Tow, Includes a swivel clip
4.0 / 5.0 Stars
Master Lock - Universal Size Trailer Hitch Lock
Universal coupler lock fitsEasy to Install
Key Entry Covered, Won’t Rust or Corrode
4.5 / 5.0 Stars
Master Lock 377KA Trailer Hitch LockTrailer hitch lock fitsEasy to Install
Keyed Alike, Rust and Corroding Resistant4.3 / 5.0 Stars
TowWorks 5/8" Trailer Hitch Locking Pin - Black Tow Hitch Receiver LockTrailer hitch locking pinEasy to Install
Spring Clip, Push Lock Design

4.3 / 5.0 Stars

How To Choose The Best Trailer Hitch Lock

If you own a trailer or tow anything like a camper or boat, it’s important to have a quality trailer hitch lock. You wouldn’t think someone would steal something as big as a boat or a trailer, but there’s a reason trailer hitch locks exist.

Best Trailer Hitch Locks reviews guide

Whether you’re moving a trailer full of all your belongings across the country or you’re going up to the cabin to relax on the boat for the weekend, protecting your valuables is important and hitch locks do just that.

Just like anything else you buy, there are certain things that can help you decide which item is best for you and your needs.

There are some features that can be crucial, while others are just a preference. Below we discuss what the top things to look out for when you’re buying your next trailer hitch lock.


When it comes to a locks material, it’s important to know what’s easy for thieves to break into and what’s not. It doesn’t take a genius to know that steel is much hard to break through than aluminum.

When you’re looking for your next lock consider the ways the material could be broken for someone to steal the trailer, camper or boat or the contents inside.

Thieves don’t want to use more than the bare minimum effort so having a lock that’s hard to bust will help deter them.

If you see a lock for sale that’s made out of cheaper materials like aluminum, don’t buy it just because they’re lightweight because this makes them easier for thieves to take off.

Look for locks that are made from hardened steel as they are the hardest to remove without the keys.

Lock Design

It may seem like design doesn’t matter when it comes to locking devices but it’s definitely more than just aesthetics. Depending on the manufacturer, one lock can be opened by anyone that has the same one since all of their keys are the same.

A few you read about above do not have this business model, therefore, you’re way less likely to get broken into. Would you want your neighbor with the same trailer lock to be able to unlock your trailer?

I don’t think so. The whole point of getting a lock is so that your valuables and often expensive items, are safe and secure.

That’s why this is one of the most important things to consider when buying your next trailer hitch lock. If it costs you a few extra bucks to get a lock that has a unique set of keys, that could be well worth it if the worst happens.

Coupler Size / Hitch Class

When it comes to coupler trailer hitch locks, you need to match it to your coupler’s ball size. If these don’t match, you could face a lot of problems. It’s pretty easy to make sure they match up.

Get the diameter of your coupler’s ball and that’s the size of lock you need. If you’re looking at a universal lock, it will most likely fit the ball just fine.

If this sounds intimidating to you, try reading some of the customer reviews online and see if they answer any of your questions. If you’re buying in store, there is likely an automotive employee available that may have answers for you.

If you have an RV, you know that the hitch has its own class, well vehicle hitches are the same way. The classes vary from class I to class V. It’s helpful to know which one your vehicle has because not all trailer hitch locks fit every class of hitch.

Think of it as getting a phone case; you wouldn’t buy an iPhone 7 phone case if you have the iPhone 8, it wouldn’t fit and it’s a waste of your money.

When you’re window shopping, you may notice trailer receiver locks and receiver hitch locks come with one of two sizes of pins: ½ inch or ⅝ inch.

Make sure your hitch will work with one of those sizes before buying! Class II hitches all need to have one with the ½ inch pins verses any class above III will need the ⅝ inch pins on their trailer lock.

If you get the wrong size, just like the iPhone analogy, it won’t fit and will be useless until swapped with one that does fit properly.

The last thing when it comes to this topic is to make sure the receivers match on both your vehicle and the lock you’re considering. Classes I – II usually match with a 1.25 inch receiver, while any class above that will use a 2 inch receiver. Again, if these don’t match, the product will be useless to you.

Lock Durability

Wanting a durable lock should be at the top of your important features list. One of the main things to consider when it comes to a locks durability is the climate you live in. Do you live somewhere where it rains a lot? Perhaps you live in Alaska and have a lot of snowy days and harsh winters. Not all trailer hitch locks will last in every climate.

A couple locks in the review earlier were rust and corrosion resistant. These are great features if you live anywhere wet or snowy. If your lock ends up rusting or corroding it could stop working entirely.

You then would have a useless lock that you paid money for. This is another area you could check the reviews for information or it can be found in a lot of product highlight sections.

On the topic of a locks durability, have a cap or cover for the keyhole is a must. This is another area that could rust if given the right conditions.

Having a cap or cover also keeps out dust, dirty and other grime that could get stuck in a keyholes crevices. Making sure the keyhole is covered and the lock is either waterproof or rust resistant could save you a lot of hassle down the road, literally.


There are several different style of hitch locks. The two most popular are coupler hitch locks and receiver hitch locks.

Receiver locks have metal pins that have the locks on the ends. While the trailer is attached to your vehicles hitch, it’s safe, but as soon as it’s not connected, the lock no longer serves a purpose. These are for people that tow and are on the road a lot rather than keeping it locked at all times for safety.

On the opposite end of that you have the coupler style. If you’re wanting a lock that will protect your trailer at all times, a coupler lock is for you.

We listed some of the best trailer coupler locks above that make sure your belongings stay safe whether you’re towing something overnight or just wanting to keep everything safe in the driveway at home.

Frequently Asked Questions (FAQ)

Q: Can someone still steal my trailer even if it has a lock on it?

A: The short answer is yes. There is no lock out there that can 100% guarantee that someone won’t break it off.

Depending on the style of lock you choose and the material it’s made out of can be determining factors of how easy it could be to steal your trailer.

Stealing a trailer is a lot easier than people think and this is why it’s important to know what to look for when buying a lock.

Q: How do I unlock the lock?

A: Depending on which specific lock you have, it’s usually as simple as inserting a key and turning clockwise until you hear a clicking sound. After you hear that click sound you usually just pull down and viola!

Q: Are trailer hitch locks hard to install?

A: Again, depending on which one you have the answer varies but most of the time they’re fairly easy and just take a few minutes.

You do want to make sure it’s installed properly by doing a slow, small test drive if you’re travelling long distance with it. The last thing you’d want is to be driving the day of a big move or event and it comes off.

Buyers Tips

You are now well-versed when it comes to trailer hitch locks, nearly an expert. After reading the reviews, the buyer guide and the FAQ, hopefully you have a better idea in mind of which lock you’d like to get.

Remember the different styles and to consider what you’ll be using it for most. If you live in a climate with seasons, get a lock that’s rust resistant to save yourself money and stress down the road.

If a lock is made out of material like aluminum, it can be busted open with a few swings of a hammer.

Consider putting in a few extra dollars to buy one made out of hardened steel. Lastly, remember to have your measurements down so you don’t end up with a product that is useless to you.

If you keep all this in mind, you’re that much closer to being on your way to buying your next trailer hitch lock. Good luck!

Thanks for reading The 5 Best Trailer Hitch Locks Reviewed. We hope our review article will help you pick the right product for your needs from among our top picks for best trailer ball locks and trailer hitch receiver locks. Wherever you’re headed stay safe out on the road and enjoy your travels.

And if you’re shopping for other gear take a look at these related review articles from Outside Pursuits:



How We Researched

To come up with the top trailer hitch locks, we researched a variety of sources for reviews such as 4×4 Magazine and Outside Online Magazine along with our own personal experience.

We also consulted online magazines for product research and reviews to get as much unbiased information as we could. To help weed out fake reviews we used to make sure we only looked at genuine reviews.

With so much quality gear available, we had to narrow it down based on what we felt were the best options were for the price. The staff authors have a wide and varied background in offroading, motorcycling, and auto mechanics. They are eager to share their knowledge with readers.

To help narrow down the selection we used personal experiences along with recommendations from fellow auto-enthusiasts and industry experts.

After extensive research, we came up with our list to help you choose the right one for you.


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Richard Moore

Richard is a co-founder of and major contributor to Outside Pursuits. He has trekking and survival experience throughout Mexico, Central America, and the Caribbean. Richard contributes his extensive travel and outdoor experience to the editorial topics and content on Outside Pursuits including outdoor gear, motorcycle accessories, auto/4x4 accessories, and tools. In 1998, he survived in the wilderness for over a week without food or specialist equipment. He was stranded on the northern coast of Honduras following Category 5 Hurricane Mitch.

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