10 Best Master Lock Trailer Hitch Locks 2026 in the United States

The Master Lock 389DAT trailer hitch locks come as a pack of three, each with a unique key number for added security. These locks are designed to fit most common trailer coupler sizes—1-7/8", 2", and 2-5/16"—making them versatile for different trailers. The bright red finish acts as a visual deterrent to potential thieves, providing an extra layer of protection.

Made to resist rust and corrosion, these locks hold up well against weather exposure, making them suitable for outdoor use over time. Installation and removal are straightforward, offering a hassle-free way to secure your trailer. With a 4.7-star rating from many users, this lock set demonstrates good reliability and satisfaction.

This lock set is a solid choice for most trailer owners looking for an easy-to-use, weather-resistant solution that fits a variety of coupler sizes.

The Rhino USA Trailer Hitch Lock Kit is a strong choice if you want to secure a 2-inch trailer hitch, like those on RVs, campers, or boats. Made from reinforced alloy steel with a powder-coated finish, it offers solid protection against rust and harsh weather, helping it last a long time outdoors. Its locking mechanism is heavy duty and tamper-resistant, aiming to keep your trailer safe from theft.

The lock fits specific coupler sizes such as 50×50 and 50×60, so it’s important to check your trailer’s coupler type before buying; it won’t fit adjustable or smaller 1-7/8-inch couplers. Many users appreciate the ease of use and peace of mind it provides. Plus, Rhino USA backs it with a lifetime replacement warranty, which is a nice bonus if you run into any issues.

If your trailer coupler isn’t one of the compatible sizes, this lock won’t work, so compatibility is a key limitation. Also, the product weighs nearly 2 pounds, which might feel a bit heavy if you want something ultra-lightweight. This lock is well-suited for owners of 2-inch standard trailer hitches looking for durable, weather-resistant security with reliable customer support, but make sure your trailer’s coupler matches before purchasing.

The Master Lock 379ATPY Universal Trailer Hitch Lock is designed to secure trailer hitches with a versatile fit for 1-7/8 inch, 2 inch, and most 2-5/16 inch trailer couplers. This makes it suitable for use with a wide range of vehicles, trailers, and RVs. Constructed from zinc, the lock offers robust resistance against rust and corrosion, ensuring durability in various weather conditions.

The advanced locking mechanism is a notable feature, designed to prevent picking and prying, which enhances security. The lock type is key-based, and the inclusion of two keys provides a backup option in case one is misplaced. The lock's dimensions (5.1 x 3.5 x 4.6 inches) make it portable and easy to handle.

This hitch lock is a solid choice for those needing a reliable, universal solution to secure their trailer hitches.