Best Master Lock Universal Trailer Coupler Lock

A good Master Lock universal trailer coupler lock can secure your precious cargo even if it’s away from your attention. In this product review and buying guide, I will share three of the best Master Lock universal trailer coupler lock products available today.

**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.

How to Choose the Best Master Lock Universal Trailer Coupler Lock

When looking for a good trailer lock from Master Lock, you need to consider the following buying factors:

Hitch Compatibility

First off, you need to determine the hitch class of your vehicle. Most trailer trucks make use of Class II hitches with 1/2-inch pins. It is important to ensure that the one you buy will fit your trailer.

In other words, the best trailer hitch lock should be the product that you can use on your trailer.

Durability

The trailer coupler lock that you buy should withstand harsh environmental conditions. The good news is that Master Lock universal trailer coupler lock products are made of materials of the highest quality. This ensures you that the trailer lock is able to prevent rust and corrosion, allowing you to use it for an extended period of time.

Authenticity

Always check if what you are purchasing is an authentic Master Lock Universal trailer couple lock. Note that other manufacturers may produce a similar product but with much lower quality.

Unique Key

A genuine Master Lock product would only make use of a unique or special key for every product. This means that you are assured that no one will have the same key that would possibly open your trailer lock. Unlike other inexpensive trailer couple locks, the keys can be photocopied.

Best Master Lock Universal Trailer Coupler Lock Products

**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, Universal Trailer Coupler Lock, 379ATPY – Best Overall

Master Lock Trailer Lock Universal Trailer Coupler Lock 379ATPY best master lock universal trailer coupler lock

Via Amazon.com

The Master Lock Trailer Lock, Universal Trailer Coupler Lock, 379ATPY is a trailer coupler lock designed to fit 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) couplers. Its advanced locking interface makes it nearly impossible to be pried or picked.

The only downfall of this particular product is being “keyed alike”, which means that buying several Master Lock universal trailer coupler lock variants will come with one and the same key that can unlock everything.

Pros

  • check
    Made of high-quality material
  • check
    Prevents rust and corrosion
  • check
    Cost-efficient
  • check
    Easy to install and remove
  • Limited lifetime warranty

Cons

  • exclamation-triangle
    The “keyed alike” feature may be the ticket for thieves to successfully unlock the trailer if they happen to have a similar key

Final Verdict

One of the best features of this Master Lock universal trailer coupler lock is its ease of use. It is designed to replace the ball, and it conveniently fits into the coupler. Together with its unique key, you can secure your trailer in a matter of seconds.

If you are planning to purchase several units of the Master Lock Universal Trailer Coupler Lock 379ATPY, ask about the possibility of having several unique keys instead of using the keyed-alike feature.


Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT – Most Affordable

Master Lock Trailer Locks 389DAT best master lock universal trailer coupler lock

Via Amazon.com

This trailer coupler lock looks similar to the Master Lock Trailer Lock, Universal Trailer Coupler Lock, 379ATPY. The only difference would be the lock’s color of the lock. Its vibrant red color is likely to deter most thieves.

This product is easy to install and remove, and it locks securely. Determined thieves may try all their might to pry on the locks.

Of course, it wouldn’t hurt to park your vehicle in a well-lighted area.

The quality of the lock is high-grade, which protects it from corrosion and rust. However, being also made as “keyed alike”, it is possible – although highly unlikely – that anyone who may have bought a similar product is likely to successfully unlock this Master Lock universal trailer coupler lock.

Pros

  • check
    Easy to install and remove
  • check
    Cost-efficient
  • check
    Prevents rust and corrosion

Cons

  • May be broken with hammer blows
  • Receive lock casing may break easily

Final Verdict

Right off the bat, you will be attracted by the bright red color of this particular Master Lock universal trailer coupler lock. While it may be eye-catching, this is actually an effective deterrent against trailer thieves. From afar, people with malicious intent will see the trailer lock and think twice about stealing your trailer.

On the flip side, though, other similar Master Lock products are more durable than this one.

If price point is your primary determining factor to buy a trailer coupler lock, this particular device is already a good choice. However, for better security, you might as well pay extra for the 379ATPY model.


Master Lock Trailer Lock, Trailer Coupler Lock, 377KA – Best in Product Design

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

Via Amazon.com

This particular trailer coupler lock from Master Lock has an advanced locking mechanism, which makes it hard to tamper with. It has a strong shackle that protects it from picking.

The lock is made to fit 1-7/8 inch along with most 59 mm trailer couplers. With this feature, it allows the lock to fit a variety of trailers. Should you ever decide to buy a new trailer, you may still be able to use this trailer coupler lock.

The Master Lock trailer coupler lock 377KA is made of durable steel, which makes it durable against rust and corrosion.

Pros

  • check
    Can serve a variety of trailers as it fits most trailer tongues
  • check
    Easy to install and remove
  • check
    Locking mechanism resists prying and picking, thereby offering maximum security
  • Made of strong and durable material (steel)
  • Resists corrosion and rust, so you are sure to be able to use it for a long time

Cons

  • The keyed-alike feature increases the risk of someone unlocking it

Final Verdict

Props to Master Lock for coming up with this beautifully designed trailer coupler lock! For starters, the stainless steel body already says a lot about the workmanship and durability placed in this device. Because it's made of steel, expect it to last a long time.

This exact same feature is perhaps one of the drawbacks of the 377KA model. It looks too shiny and sophisticated to be extremely secure as well. This device could have been best overall in our book, except that the Master Lock Universal Trailer Coupler Lock 379ATPY beats it by a hair.

Nevertheless, both the 379ATPY and the 377KA models appear in our best trailer lock review. This goes to show that you'll get the best deal in either of these two products.

Final Word

Using any of these Master Lock universal trailer coupler lock products can help deter thieves from taking your vehicle. However, you also must make additional security measures such as:

  • Parking your vehicle in a well-lit area
  • Using authentic Master Lock products
  • Adding another locking system such as a trailer wheel lock
  • Add a car alarm system
  • Make use of sturdy chains to lock the trailer wheels

By following our tips above, you should get the best deal for a Master Lock universal trailer coupler lock.

Chito Joseph