10 Best Boat Trailer Lock 2025 in the United States

The Proven Industries Model 2516 Trailer Lock is a heavy-duty security device designed specifically for 2 5/16-inch couplers. Made from hardened steel, it offers robust protection against thieves, making it a good choice for those concerned about trailer security. The lock is resistant to common burglary tools like hammers and crowbars, which significantly enhances its security credentials.

One standout feature is its unique key design, which makes it difficult for anyone to pick or duplicate the key, adding an extra layer of safety. The lock also secures safety chains, providing comprehensive protection for your trailer or camper. The lock is made in the USA, assuring users of its high manufacturing standards.

However, its compatibility is limited to specific trailer couplers, so users need to ensure it fits their trailer model before purchasing. With dimensions of 6 x 5.5 x 6 inches and weighing 10 pounds, it is relatively bulky, which might make it less convenient to handle. On the bright side, its weather-resistant properties mean it can withstand various environmental conditions, ensuring durability and long-term use. Users who prioritize maximum security and durability in their trailer locks will find this product highly beneficial. However, those seeking a more versatile lock that fits a wider range of trailer couplers might need to look elsewhere.

The Master Lock 379ATPY Universal Trailer Hitch Lock is a solid choice for securing boat trailers, as well as other trailers and RVs. It uses a key lock mechanism with an advanced locking system designed to resist picking and prying, which adds good security against theft attempts. Made from zinc, this lock offers decent resistance to rust and corrosion, making it suitable for outdoor use in varying weather conditions, though it might not be the toughest in extremely harsh environments.

Its size is quite versatile, fitting the common trailer coupler sizes of 1-7/8 inches, 2 inches, and most 2-5/16 inch couplers, so it covers a wide range of trailers without needing multiple locks. Weighing about 1 pound and being portable, it’s easy to carry and install. Users find it straightforward to use, locking and unlocking with the included two keys.

The downside is that since it’s made of zinc rather than heavier-duty steel, it might not withstand very aggressive attacks as well as some premium locks. Also, it relies on a key, so losing the keys could be inconvenient. This lock balances good security, compatibility, and weather resistance at an affordable price, making it well suited for everyday trailer security needs without extra complexity.

The AMPLock U-BRP2 is a heavy-duty trailer coupler lock designed specifically for 2-inch ball hitch trailers, making it a solid choice for securing boats, RVs, and travel trailers. Its stainless steel construction offers strong resistance against rust and corrosion, which is essential for outdoor use in varying weather conditions. This means it can handle rain, snow, and salty air without losing its protective qualities over time. The lock features a patented two-part design with a flat lip that fits snugly around the trailer coupler, providing a secure barrier that effectively deters theft.

One of this lock’s standout features is its simple push-and-lock mechanism, which makes it quick and easy to use—even if you’re not very handy with tools. This ease of use is great when you need fast security without fussing with complicated locks. The size compatibility is straightforward, tailored to the common 2-inch ball couplers found on most trailers, ensuring a proper fit without guesswork. While it’s a bit on the heavier side at around 10 pounds, this weight reflects the robust build quality and contributes to its security. The product comes with keys and includes a one-year limited warranty, adding some peace of mind regarding its durability.

It’s important to note that this lock may not fit couplers smaller or larger than 2 inches, so checking your trailer’s size beforehand is recommended. Although the lock resists many advanced theft methods, no lock is completely theft-proof, so it’s best used as part of a broader security approach. The AMPLock U-BRP2 delivers strong, weather-resistant protection with user-friendly operation, making it a dependable choice for boat and travel trailer owners looking for hassle-free security.