10 Best Fifth Wheel Locks 2025 in the United States

The Andersen Ultimate 5th Wheel Connection Lock is built with ultra-high security in mind, featuring a proprietary design that fits all versions of the Andersen Ultimate 5th Wheel connection. Its heavy-duty construction utilizes 3/16-inch fully welded cold rolled steel, making it highly resistant to bolt cutters and crowbars. The bright yellow powder coat finish serves as a deterrent to potential thieves.

The Trimax puck lock included is a hidden-shackle padlock designed to prevent theft, emphasizing the lock's security aspect. This product is particularly suitable for users looking to secure their fifth-wheel trailer with a robust and visible lock mechanism.

Its dimensions of 11.5 x 4.5 x 7 inches ensure compatibility with most fifth-wheel connections, and the steel construction guarantees durability and strength. The included components, such as the Trimax puck lock and two keys, add convenience and value to the purchase. If you need a sturdy and secure lock for your Andersen Ultimate 5th Wheel connection and prioritize security above all, this product is a worthy consideration.

The Proven Industries Model PL-5 Fifth-Wheel Kingpin Lock is designed to provide robust security for industrial and heavy-duty fifth wheels, including 18-wheelers and RVs. Made in the USA, it boasts a solid-steel TIG-welded collar and a 303 stainless-steel pin, making it highly resistant to power tools and bolt cutters.

Its unique key design prevents lock picking and unauthorized key duplication, enhancing security further. The lock is versatile, fitting various fifth-wheel trailers and accommodating lube plates, which adds to its universal appeal.

Some might find its weight (4 pounds) a bit cumbersome. Additionally, the product does not mention any specific weather-resistant features, which could be a concern for users in harsh climates. Despite these minor drawbacks, if you need a reliable and sturdy lock to protect your trailer or RV from theft, this model is worth considering.

The BOYISEN 5th Wheel King Pin Lock is a solid choice for securing fifth-wheel trailers, RVs, and campers. Made from solid steel, it offers a durable and robust solution that is hard to break, providing substantial resistance against theft attempts.

One of its standout features is the added handle and an outward-turning cylinder, making it more user-friendly compared to other designs that have downward cylinders. This makes locking and unlocking more convenient, which is a big plus for regular use. The lock comes with three keys, ensuring you have backups in case one goes missing. Additionally, the lock is keyed uniquely, so you won't have to worry about other BOYISEN lock owners having the same key.

Its high visibility, thanks to the warning tag, helps ensure you don't forget to remove it before hitching and acts as a deterrent to theft. The lock is designed to withstand various weather conditions, which is crucial for outdoor use, ensuring it remains functional over time. It fits universally, making it suitable for a range of vehicles, from RVs to semi-trailers. However, at 2.2 pounds, it is relatively lightweight, which might give an impression of less sturdiness to some users despite its solid steel construction. Another potential drawback is that while it is resistant to most tampering methods, no lock is entirely invulnerable. Still, its robust design and thoughtful features make it a reliable choice for anyone needing a secure fifth-wheel lock.