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" Heavy Duty Trailer Hitch Lock is built with tough alloy steel designed to provide strong anti-theft protection for trailers, campers, boats, and more. Its standout feature is the patented push-button puck lock, which lets you secure your trailer quickly without fumbling with keys, making it very convenient for busy or on-the-go users. The lock comes with three drill-resistant, anti-pick keys, offering reliable security while still allowing fast access when needed. It fits 2-inch couplers perfectly, creating a snug seal that thieves will find hard to tamper with, which makes it a solid choice for a wide range of trailer types from heavy-duty trucks to utility trailers.

Weather resistance is another strong point; with a corrosion-resistant powder coating and sealed core, the lock withstands harsh conditions like coastal salt spray and freezing weather, so it won’t easily rust or get stuck. The design also includes thoughtful touches like extra chain storage and full coverage shielding for added durability and protection.

On the downside, this lock is quite heavy at over 11 pounds, which could be a consideration if you want something lighter to carry around frequently. It only fits 2-inch couplers, so it won’t work for trailers with different sizes. It lacks a warranty, which might be a concern for some buyers looking for extra assurance. With a strong customer rating around 4.5 stars, the NiwNiw lock is a reliable choice for those needing a robust, weatherproof, and easy-to-use trailer lock, especially suited for heavy-duty and commercial applications.