Best Trailer Coupler Lock – 13 Handpicked Reviewed with Guide
It’s easy to understand why many people have a hard time selecting a trailer coupler lock. It's because they want the best one possible to secure their trailer.
Observing this, we gathered all the popular trailer coupler locks available in the market and put them through a series of tests. Afterward, we ranked them in terms of their performance.
Today, we’ll look in-depth at some of the best trailer coupler locks. We will also determine how you can identify your needs to decide which one would be best for you.
Best Trailer Coupler Lock
This stainless steel lock is weatherproof and also dirtproof. It locks automatically when the key is removed and it can also work with your vehicle’s ignition key.
2nd Best Trailer Coupler Lock
This lock can stand up to all sorts of attacks as well as tough weather conditions. It’s incredibly solid and is made from high-quality materials.
3rd Best Trailer Coupler Lock
Coming with an advanced locking mechanism, this product is near impossible to pick. It’s extremely resistant to rust and will last you a long time.
These three products have definitively stood out as the best of the bunch.
Now, let’s get into the extensive reviews for the top 13 best trailer coupler locks.
Best Trailer Coupler Lock - Top 13 Reviews
This trailer lock is incredibly easy to make use of. It doesn’t take up a lot of space and is also relatively lightweight. Don’t be fooled by its light weight though as it’s incredibly durable and can stand up to all sorts of cutting, prying or picking attacks.
The great thing about this lock is that you don’t need to carry around an extra key to lock and unlock it. You can use your towing vehicle’s ignition key to lock and unlock this product. This is a very unique feature that you won’t find in any of its competitors.
Features of BOLT 7018448 5/8" Lock - Best Trailer Coupler Lock
Dimensions: 9.1 inches x 1.6 inches x 1.6 inches
Weight: 1 pound
⅝ inch diameter pin
Auto-return spring lock
Limited lifetime warranty
This product is a heavy-duty coupler lock that can stand up to anything that a thief can throw at it. The manufacturer boasts that it is cut and drill-resistant. They’ve even gone the extra mile to make this lock resistant to high-end techniques such as acetylene torches and even liquid nitrogen.
It’s an incredibly robust product that will not rust over time. You can rest easy with this lock in place, knowing that your trailer is not going anywhere.
Features of AMPLock U-BRP2516 RV/Trailer Coupler Lock
Dimensions: 7.0 inches x 6.0 inches x 8.50 inches
Weight: 12 pounds
Cylindrical locking mechanism
Resistant to torch-cutting
This product comes in a bright red finish which may be off-putting to some but if you think about it, it’s actually a great asset to this product. The bright red color acts as a strong visual deterrent that discourages potential thieves from trying to break into this lock.
It can fit onto a wide variety of trailer couplers which explains why it’s a very popular lock among trailer owners.
Features of Master Lock - Universal Size
Dimensions: 6.5 inches x 4 inches x 7.5 inches
Weight: 2 pounds
Fits 1-⅞ inches, 2 inches and 2-5/16 inches trailer couplers
Pick-resistant locking mechanism
Comes as a single product or in a pack of 2
This coupler lock is made in the USA with the highest-grade Aluminum. It’s made to be easy to use, it’s corrosion-resistant and has the ability to withstand the toughest environments.
Considering how cheap it is, the quality it offers really is astounding. We thought it would be made of sub-par Aluminum that would be easy to break into but we were thoroughly surprised when we ran our tests on it.
This product comes with three different hole positions. This allows you to choose how exactly you want to lock it depending on your situation.
Features of Blaylock TL-33 Coupler Lock
Dimensions: 7.9 inches x 5.6 inches x 5.0 inches
Weight: 4 pounds
Fits 2 inches and 2-5/16 inches couplers
Made of high-grade Aluminum
Fits over 30 different coupler style brands
Master Lock is one of the leading brands when it comes to locks and if they keep coming out with products like these, that isn’t changing any time soon.
This product features an incredibly smart design that not only makes it very easy to use but also makes it very easy to store when not in use. The lock is very lightweight too so you don’t have a lot of trouble carrying it around from your vehicle to the trailer coupler.
Features of Master Lock 377KA Trailer Lock
Dimensions: 5.6 inches x 4.3 inches x 2.8 inches
Weight: 2.2 pounds
Fits 1-7/8 inches, 2 inches and most 2-5/16 inches trailer couplers
Available in packs of 1, 2, 3, 4 or 5
Comes with two keys
This product comes with everything you want from a trailer coupler lock and more.
It’s available in two different sizes for you to choose from so it can fit onto your trailer coupler no matter what its size is. Not to mention that it comes with several O rings that you can add or remove. This tweaks its thickness so it’s as tightly locked onto your coupler as you want.
Features of TowWorks Keyed Alike 5/8" Trailer Hitch Locking Pin Set
Dimensions: 7.7 inches x 2.4 inches x 1.2 inches
Weight: 2.45 pounds
Available in two different sizes
Comes with two keys
Powder-coated to prevent corrosion
Compared to most of its competitors, this lock sits a little more to the front of the hitch of your trailer. This gives it the added benefit of being very hard to maneuver for a thief. This makes it very resistant to both leverage as well as hammering attacks.
Its unique design makes it simple to use and also shields it from all sorts of tampering devices and cutting tools that many thieves utilize.
It comes with two keys in case you lose one.
Features of Tow Ready (63228) 'Gorilla Guard' Coupler Lock
Dimensions: 7.0 inches x 6.0 inches x 3.00 inches
Weight: 2.1 pounds
Fits most 2 inch trailer couplers
Two keys included
Durable design that stands up to heavy hammering attacks
This lock comes with a fairly simple but effective design. It comes with an adjustable loop that you can utilize in order to decide how loose or tight the lock should be on your trailer coupler.
Its bright Yellow design can work as a visual deterrent for thieves as it makes it stand out.
Due to its adjustable loop and 11 different locking positions, this lock is extremely versatile. It can be used with a number of different coupler style brands.
It has an Aluminum body but its shackle is made of solid steel that is extremely difficult to cut through no matter which tool you use.
Features of REESE Towpower 72783 Universal Coupler Lock
Dimensions: 9 inches x 3 inches x 9 inches
Weight: 1 pound
Steel lock bar
11 different locking positions
This is another top-notch product from Master Lock. This aims to tackle the problem of trailer coupler locks deteriorating over time due to tough weather environments.
They do this using a snap-on cover for this lock that not only protects it from harsh weather but also makes the lock quite inconspicuous.
It’s an extremely lightweight lock that you’ll have no trouble carrying. It’s definitely a great option for people that are going to be locking and unlocking their trailer fairly regularly.
Features of Master Lock Black 2866DAT 1/2 in. and 5/8 in. Swivel Head Receiver Lock for Class I-IV
Dimensions: 8.6 inches x 3.8 inches x 1.6 inches
Weight: 1.1 pounds
Can withstand up to 3500 pounds of pressure
Four-pin cylinder locking mechanism
Snap-on cover for weather-resistance
We knew we would run into some products that would exceed our expectations when we started these tests. However, this product really did go above and beyond.
Its nylon jacket protects it from all sorts of external factors such as rain or snow.
Its durable construction consists of hardened steel that stands up to all sorts of prying or cutting attacks. We weren’t even able to get into it using an acetylene torch. Rest assured that if you use this lock on your trailer, no thief is going to be able to break into it using regular tools.
Features of Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock
Dimensions: 17 inches x 13 inches x 13 inches
Weight: 6 pounds
Ballistic-grade Nylon housing
Fits 1-⅞ inches, 2 inches and to 2-5/16 inches couplers
It’s a fact that many low-quality locks tend to become brittle and easy to break into when they’re exposed to colder environments. This is a very valid concern among trailer owners and a concern that Master Lock has addressed very effectively with this product.
You can lock your trailer up with this lock and leave it out for as long as you want. The lock is going to remain as strong and as resistant to break-ins as it would be in normal conditions.
Features of Master Lock Receiver Lock
Dimensions: 8.0 inches x 4.0 inches x 2.00 inches
Weight: 11.2 ounces
Available in Stainless Steel or Chrome finishes
Proven Industries is a trusted lock manufacturer thanks to products like these.
It features solid steel construction. This makes it bolt-cutter-proof and also very resistant to other break-in techniques. For example, it’s also drill resistant and cannot be broken into using heavy hammer blows either.
It’s an extremely versatile lock that you can use on an RV or even on camper or travel trailers. If you travel a lot with your trailer then this is definitely a lock you can look into buying. You can even use it to secure security chains.
Features of Proven Industries Lock Model
Dimensions: 7.7 inches x 7.4 inches x 7.2 inches
Weight: 8 pounds
Available in different sizes
Coming in an all-black finish, this trailer coupler lock is inconspicuous. It also features construction that can stand up to the toughest and most brutal break-in techniques.
It has an Epoxy coating and protective rubber cap that protects it from all sorts of external factors and also makes it incredibly durable. We’ve been testing this product for months and have put it through several different experiments to test its durability and it’s still as good as new.
The O-ring Seal also ensures that all dirt and grime is kept out of it. This increases its longevity and ensures it will be in perfect condition for years to come.
Features of Trimax T-3BLACK Premium 5/8" Key Receiver Lock
Dimensions: 1.2 inches x 5.8 inches x 8.8 inches
Weight: 14.4 ounces
Black Epoxy powder coating
Protective rubber cap
Best Trailer Coupler Lock - Buyers’ Guide
What is a trailer coupler lock and how does it work?
A trailer coupler lock is a special type of trailer RV lock that prevents criminals and thieves from stealing your vehicle. It secures the receiver and trailer hitch securely together and they cannot be separated from each other without the use of a valid key.
It stops any potential thieves from lifting your receiver. Thus, they cannot unhitch your trailer from your vehicle and hitch it onto theirs and flee with it.
A coupler lock requires you to detach your trailer from your truck before you can fit the ball into the coupler of the trailer hitch.
If you have a trailer that you leave unattended for extended periods of time or if you live in a high-risk area, then a trailer coupler lock is a must-buy. Not only will it effectively deter potential thieves but it will also give you peace of mind.
What are some things to think about before buying a trailer coupler lock?
Here are some factors you should definitely keep in mind before buying a trailer coupler lock:
You have to understand that normally, trailer coupler locks don’t come in a one-size-fits-all type fit. That’s why you should measure the size of your coupler before you go out to buy a trailer coupler lock. If you end up buying the wrong size, you’ll have an extremely hard time locking your trailer. In fact, in most cases, your trailer coupler lock will fail to even lock in place with your coupler, thus, rendering it useless.
Most trailer coupler locks come with either ½ or ⅝ inch pins, you can inspect your coupler to check which size it will be compatible with.
Of course, the material with which your trailer coupler lock is made goes a long way in determining how high its quality is and also how secure it is. Most trailer coupler locks that are long-lasting and also secure are normally made up of some sort of premium alloy. An example of this can be hardened steel with some sort of coating. The hardened steel makes it very difficult to cut through or pry open while the coating protects it from harsh weather conditions.
You may come across some manufacturers that advertise the use of lighter alloys such as Aluminum. These alloys are utilized due to their lightweight benefits. While it’s true that such trailer coupler locks are lightweight but this also means that they are relatively easy to break into.
Thus, you have to make a decision about what you want your priority to be: Convenience or security.
How hard is it to steal a trailer?
Whether stealing a trailer is hard or easy for a thief depends entirely on you.
For example, it would be extremely easy for a thief to steal it if you left it unattended without a lock in your driveway. It can also be very easy to steal if you leave it unattended even for a few minutes on the road without a trailer coupler lock.
Even if you secure it with a trailer coupler lock, the lock can be cheaply built and have design flaws that a potential thief could exploit.
In the end, you just have to take all the precautions that you can and utilize a high-quality trailer coupler lock to keep it secure.
What are some problems that can occur with cheap locks?
The problem with cheap locks is two-fold.
The first aspect of it is that such locks are often made with sub-par materials. Not only does this make them vulnerable to all sorts of cutting, prying and leverage attacks but it also means that they won’t last you a very long time. The lock will begin to rust and deteriorate over time and you’ll eventually have to replace it.
The second problem is that these locks are often built without too much care put into how they’re designed. As a result, they have several design flaws that can be exploited in order to break into them. These design flaws very often become common knowledge among thieves who can then break into your lock in no time.
Best Trailer Coupler Lock - FAQs
How do I lock a trailer coupler?
It depends highly on the type of trailer coupler lock you have and its manufacturer. Most trailer coupler locks come with an instruction manual with clear instructions that detail how you can use them.
If you’re still confused about how to use them, you can always look up its make and model online. Oftentimes, you can find videos that explicitly show how you can lock and unlock them.
Can I drive with my trailer lock on?
Some trailer coupler locks may be designed to be able to withstand being driven with. However, we strongly recommend that you don’t do this. Most coupler locks are only designed to be locked into place when your trailer and its towing vehicle is stationary.
Can trailer coupler locks wear out and stop being effective?
Most high-quality trailer coupler locks are designed to last you a lifetime. They can withstand harsh weather conditions such as rain and snow and they can also stand up to all sorts of cutting, drilling or hammering attacks.
What are some tips and tricks when it comes to preventing theft of my trailer?
Here are some tips regarding trailer coupler locks and how you can protect your trailer from being stolen:
- Assume a thief is going to try and steal your trailer every time you leave it unattended. If you keep this in your mind, you’ll never forget to lock your trailer whenever you leave it out of sight.
- Paint a notable marking on the trailer as well as the trailer coupler lock.
- Try to park in public places where it’s normally crowded.
How does a trailer coupler lock help in my trailer not getting stolen?
A trailer coupler lock attaches to your trailer’s coupler just like a regular hitch ball would. It’s locked into place and thus, a thief would have to get through this lock if they are to flee with your trailer. Getting through the trailer coupler lock would require a lot of time and resources and would also make a lot of noise. It’s very unlikely that a thief would be successful in doing so.
What are some reliable brands when it comes to trailer coupler locks?
Some dependable brands that you can buy trailer coupler locks from are:
- Master Lock
- Proven Locks
Trailers are a huge investment and so, it makes sense that people would want a robust and sturdy lock that can keep them securely in place.
After tons of debate, our team has concluded that the BOLT 7018448 5/8" Lock is definitely the best. It’s reasonably priced and the value it provides with its high-quality, durable exterior is unparalleled.
And we’re at the end of our post for the best trailer coupler locks.
Give us feedback and let us know what trailer coupler lock you’re using these days.