10 Best Trailer Tongue Locks 2025 in the United States

The AMPLock U-BRP2 is a strong and reliable trailer coupler lock designed for 2-inch ball hitches, making it a solid choice for RVs, boats, and travel trailers. It’s made from rust-resistant stainless steel, so it stands up well to harsh weather and resists corrosion, which is important if you store your trailer outdoors. The lock uses a patented two-part push-and-lock system, allowing you to secure your trailer quickly and without fuss—this ease of use can be a big plus if you want dependable security without complicated steps.

Its snug, customized fit helps deter theft effectively, and the design also protects against more advanced break-in attempts, adding extra peace of mind. With a strong brand reputation reflected in many positive reviews and a one-year limited warranty, it’s clear this lock is trusted by many users. On the downside, it weighs about 10 pounds and is somewhat bulky, which might make it less convenient to carry around frequently.

Also, while the lock fits standard 2-inch ball couplers, it won’t work with other sizes, so compatibility is limited to that hitch size. If you need a heavy-duty, weatherproof lock that’s easy to use and offers solid theft protection for a 2-inch trailer ball, the AMPLock U-BRP2 stands out as a dependable option.

The AMPLock U-BRP2516 Heavy Duty Trailer Coupler Lock is designed for serious security on trailers and RVs with a 2 5/16-inch ball coupler and straight lip. Made from durable stainless steel, it offers strong resistance against cutting, drilling, rust, and weather damage, making it a good choice for outdoor use in various climates. Its push and lock system simplifies installation and daily use, eliminating complicated locking steps.

The customized fit ensures the lock snugly secures the trailer tongue, reducing chances for theft. It weighs about 10 pounds, which might be a bit heavy if you prefer something lighter to carry. Also, the lock is specifically tailored for 2 5/16-inch straight lip couplers, so it won’t fit other sizes or styles. The one-year limited warranty offers some peace of mind, although it’s fairly standard and excludes misuse or damage outside normal conditions.

This lock is ideal for trailer owners who want high-strength, weatherproof protection without fuss, especially those with compatible coupler sizes looking for a straightforward and effective anti-theft device.

The Master Lock 379KA-4 Keyed Alike Universal Trailer Coupler/Tongue Locks offer a practical solution for securing trailers with a set of four locks that all operate with a single key. This feature is particularly convenient for individuals managing multiple trailers, as it reduces the hassle of dealing with different keys. The reinforced zinc die-cast material provides impressive durability and resistance to rust and corrosion, making these locks suitable for outdoor use. This construction also offers high impact resistance, which is beneficial for withstanding potential tampering attempts.

The locks are designed to fit a wide range of trailer couplers, enhancing their compatibility across different brands like Reese, Fulton, and others. The advanced locking mechanism is intended to resist picking and prying, offering a layer of security against theft. Additionally, the locks are lightweight and straightforward to install, which aids users who may not be mechanically inclined.

While the product comes with a Limited Lifetime warranty, if multiple packs are ordered separately, they may not be keyed alike unless specified. This could be a drawback for users expecting uniformity across their locks. Furthermore, while the zinc material is robust, it may not offer the same level of security as more advanced locking systems or materials designed to withstand extreme force or sophisticated break-in techniques. These locks are a solid choice for general trailer security needs, backed by a reputable brand. They are especially ideal for users seeking ease of use and effective protection against casual theft attempts, though users with high-security demands might want to explore additional options.