10 Best Trailer Tongue Locks 2025 in the United States

The Master Lock 379ATPY Universal Trailer Hitch Lock is a versatile option that fits a range of trailer couplers, specifically 1-7/8 inches, 2 inches, and most 2-5/16 inches sizes, making it suitable for various vehicles, trailers, and RVs. One of its standout features is the advanced locking mechanism designed to resist picking and prying, enhancing security. Constructed from zinc, the lock is durable and resistant to rust and corrosion, which is a significant advantage for outdoor use.

The inclusion of two keys adds convenience, ensuring you have a spare if needed. However, users should note that while zinc is rust-resistant, it may not be as strong as other materials like hardened steel. This lock is also relatively portable, given its dimensions of 5.1 x 3.5 x 4.6 inches. The brand Master Lock has a solid reputation for producing reliable security products, which adds an element of trust.

On the downside, the key lock mechanism might not be as quick and easy to use as some alternative locking mechanisms, like combination locks. Additionally, while the product claims weather resistance, it's essential to ensure regular maintenance to keep the lock in optimal condition. The Master Lock 379ATPY is a dependable choice for those seeking a balance between security, compatibility, and durability.

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 NiwNiw 2-5/16" Heavy Duty Trailer Hitch Lock is a solid choice for anyone needing strong protection for heavy-duty trailers. Made from alloy steel with a corrosion-resistant powder coat, it offers excellent durability against harsh weather conditions like coastal salt spray or snowstorms. Its design fits 2-5/16 inch couplers perfectly, creating a tight seal that reduces the chance of tampering, making it ideal for RVs, boats, utility trailers, and more.

The lock uses a patented push-button puck mechanism that lets you secure the trailer quickly without fumbling for keys, which is handy for busy or hurried situations. When you need to unlock, the included three drill-resistant and anti-pick keys provide reliable security without hassle. Customers appreciate the lock’s toughness, noting it resists cutting and freezing attacks, supporting the claim that it’s built to withstand serious theft attempts. The NiwNiw brand has a decent reputation, with positive user reviews highlighting its real-world durability and ease of use.

One consideration is its size and weight (over 11 pounds), which might be bulky for some users, and the product doesn’t come with a warranty, so keep that in mind. Also, it’s specifically made for 2-5/16 inch couplers, so double-check your trailer’s size before buying. If you want a weatherproof, heavy-duty lock that’s straightforward to use and offers excellent anti-theft protection for larger trailers, this NiwNiw model is worth considering.