Best Trailer Coupler Locks #1 Review In 2020

The best trailer coupler lock can secure your precious cargo conveniently and without worry. During those times when you need to leave your trailer for a short while, hooking up the best kind of trailer lock can already make a huge difference.

In this article, we have reviewed the best trailer coupler lock products designed to bring stronger protection and security for your trailer. Check out each product and see for yourself which one will work best for you.

**Below, you'll see more detailed reviews, but you can also click the links above to see current prices and read customer's reviews on Amazon.

What is a Trailer Coupler Lock?

Much like installing locks on your home doors, your trailer will also need some sort of security measure to ward off burglars. A trailer lock does the job of preventing the theft of your trailer by preventing any vehicle from attaching itself to your unattended trailer.

A conventional trailer includes a coupler, which attaches to the hitch of the towing vehicle. In this light, the trailer coupler lock is a special kind of security device specifically designed to attach to the trailer’s tongue. Like most trailer locks, the best trailer coupler locks come with a key to detach it so that the carrier can whisk off the trailer.

 If you install a trailer coupler lock, the chances of having your trailer stolen is reduced to nil. Most of the best trailer coupler lock products in the market are designed to be used on the coupler.

Reviews on the Top 3 Best Trailer Coupler Lock Variants

**Below, you'll see more detailed reviews, but you can also click the links above to see current prices and read customer's reviews on Amazon.

Master Lock Trailer Lock Trailer Coupler Lock 377KA best trailer coupler lock

Master Lock has been in the business of security long enough to make sure that this product will guard your trailer from malicious intent. The Master Lock Trailer Coupler Lock 377KA comes in a sturdy design and is made of materials that don’t corrode or rust.

Its flexibility of use makes this product perfect for trailers and RV hitch locks. It’s also easy to install and detach, but only if you use the key designated to open it. Otherwise, its advanced locking mechanism makes this device a tough nut to crack.

The product’s ingenious design allows it to be protected from being broken with a hammer or any blunt force impact. The only way to dislodge this trailer coupler lock is through the key.

In addition, the Master Lock Trailer Coupler Lock 377KA is compatible with the following trailer couplers: 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm).

These features make the Master Lock Trailer Coupler Lock 377KA worthy to be dubbed the best trailer coupler lock overall in our list.


  • Convenient to lock and unlock
  • Advanced locking mechanism makes it secure from lock picking
  • Comes with a limited lifetime warranty


  • May not be compatible with 2 5/16" Airstream hitch
  • May not be durable enough to withstand a strong hammer force

MegaHitch Lock Coupler Vault Pro best trailer coupler lock

If it’s convenience you’re looking for, then this best trailer coupler lock will do you wonders. The MegaHitch Lock Coupler Vault Pro is one of the easiest trailer locks to install.

Don’t be fooled by its ease of use, though. This product is designed to keep burglars fiddling for hours for naught, because of the lock’s hidden cam lock security mechanism that’s hidden on the undercarriage. It’s also made of durable material to withstand blunt force.

MegaHitch Lock Coupler Vault Pro fits most conventional 2” and 2 5/16” hitch balls.


  • Extremely easy to install
  • More universal compatibility than some of the best trailer coupler lock products
  • Security mechanism hidden on undercarriage to heighten security


  • A bit on the expensive side

Trimax UMAX100 Premium Universal Solid Hardened Steel Trailer Lock best trailer coupler lock

One look at this baby will give you the assurance that your trailer will be secure. This trailer lock from Trimax boasts of hardened steel protection and a sturdy design that makes any malicious intent extremely difficult to pull off. This is because of the product’s dual ratchet lock system.

This product is designed to be easy to install, and to fit several types of couplers.

With its secure design and strong build, the Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock comes with a lifetime warranty.

With these features, it shouldn’t come as a surprise that we’re tagging this product as having the best value for your money.


  • Easy to install
  • Durable and secure
  • Compatible with several kinds of trailer couplers


  • May look loose in large hitches
  • Key mechanism is a bit more complicated than those of other products

Advantages of Using the A Trailer Coupler Lock

If you’re not convinced that the best trailer coupler lock will benefit you, then you’re probably not considering security as a priority. Trailer coupler locks can secure the coupler section, so that no towing vehicle can pull your trailer without your permission or awareness.

Choosing the best trailer coupler lock instead of opting for cheap variants will also ensure that no one can pick the lock or break it into pieces easily. The best locks of this kind are extremely difficult to destroy, and can only be opened by a unique key.

Additionally, locking your trailer coupler minimizes corrosion and damage by preventing unnecessary connections onto the trailer.

The Best Trailer Coupler Locks to Put On Your Vehicle

What’s great about the trailer coupler locks on this list is that they’re thoroughly tested by their manufacturers to not only keep your trailer secure but also last a long time.

It would be a wise idea, though, to park your trailer in a safe place. In addition, you may opt to use a wheel lock to fortify the security of your trailer.

By buying these highly recommended and best trailer coupler lock products above, you can say goodbye to worries and say hello to a more secure trailer.

Chito Joseph