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 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.

The Master Lock 379KA-3 set includes three trailer coupler locks that all open with the same key, making it convenient if you need multiple locks without juggling different keys. Each lock comes with two keys, so you get six keys in total. These locks are designed to fit most common trailer couplers (1-7/8", 2", and 2-5/16"), so they work with many brands and types of trailers. They’re made from reinforced zinc die-cast, which is strong and resistant to rust and corrosion, helping them hold up well outdoors.

The design sits on top of the coupler, which makes it tougher to break by hammering, and it can rotate slightly to reduce the chance of being forced open with brute strength. The locking mechanism is advanced and resists picking or prying, adding extra security. Installing and removing these locks is straightforward, so they’re user-friendly. It is important to note that if you order multiple 3-packs separately, they won’t necessarily use the same key unless you order the special 6-pack. The locks weigh about 2.4 lbs each, giving a solid feel without being too heavy.

This product is highly regarded by many users for its reliability and quality. Although some descriptions mention cast iron, the main body is zinc alloy, which offers toughness and excellent corrosion resistance. These locks provide reliable protection against theft and weather, especially for trailer owners who want multiple locks operated by one key. They combine solid build quality, strong security features, and ease of use, making them suitable for everyday trailer security.