10 Best Trailer Locks (Buying Guide) in 2021

Fun fact: Master Lock’s founders Harry Soref, P.E. Yolles, and Sam Stahl are the inventors and patent holders for the now-ubiquitous padlock. For the last 100 years, this company has led the innovation curve in security devices, and their Universal Coupler Trailer Lock makes the top of our list for that very reason.

Designed to fit a wide variety of receiver hitches, Master Lock Universal Size Coupler Trailer Lock ensures that no one can attach their own hitch to your trailer. This universal lock features a bright red powder coat. This color ensures that you can easily find it in your vehicle and deter thieves from afar. If you are an active cyclist, make sure to also check out these reliable bike locks for maximum safety.

AMPLOCK is another highly trusted brand in the security business, and their RV/Trailer Coupler Lock offers a unique take on your trailer’s security. This black, powder-coated, U-shaped coupler attaches to your trailer’s receiver hitch and pins the ball to the receiver with the turn of a key. This mechanism is impossible to reverse without a key, and the shield of steel surrounding the ball would be incredibly hard to cut or bend.

To ensure that the locking system is safe in all weather environments, AMPLOCK finished the alloys to ensure rust won’t accumulate. No matter how cold or wet it is outside, the push-to-lock system is so simple that you can do so with gloves on. If you also want to protect your home the best way possible, browse our list of the best smart door locks everyone is buying.

Reese Towpower Tow ‘N Store Lock Kit comes with everything you need to secure and store your trailer. Included in the kit is a brass coupler lock, which allows the Coupler to be locked to the vehicle while in tow. Additionally, a dual bent-pin receiver fits both 5/8 and ½-inch receivers for a wide variety of applications.

The bright yellow finish of this lock will ensure that you can see it from afar, whether you’re looking for it in the garage or a thief is eyeballing your trailer. If you are also looking for reliable protection for your laptop, here are some quality laptop locks to consider, too.

This lock is the heavy-duty version of the REESE Towpower Coupler Lock. If you have a big trailer with costly equipment inside, or you want to be extra sure, this is the trailer lock for you. Built with heavy-duty steel, someone would have to be incredibly motivated and have a lot of time on their hands to get through this design.

Grey in color, the Reese Towpower Heavy Duty Coupler Trailer Lock is easy to spot from a distance, so you won’t have to worry about people even approaching your trailer. A ratcheting locking system creates tension on the bridge over the ball head to ensure there’s no extra play in this gadget.

Much like a hitch pin and clip, a hitch lock threads through the fastener hole on either side of the receiver tube. This design allows the lock to hold the hitch-mounted accessory in place. This CURT Black Trailer Hitch Lock will enable you to lock your ball mount trailer to your hitch, and you can keep it on even when you are on the go. This locking mechanism is safe, secure, and incredibly small, so it stores easily when not in use.

Finished in a matte black, this 5/8-inch pin fits perfectly in a 2-inch receiver but won’t work in double-walled receiver tubes. This key-activated device is sealed and waterproof to ensure you have years of security — just don’t lose the key! If you are a motorcyclist, don’t forget to protect your favorite ride with one of these top motorcycle locks, as well.

The CZC AUTO Black Trailer Hitch Coupler Lock is the smallest option on our list but still offers great security for your trailer. This compact, black-finished key lock creates a barrier between your trailer and thieves by ensuring that the pinhole behind the receiver stays closed, which won’t allow anyone to release the trailer from the hitch. Our buying guide on best-selling combination locks features some more useful products like this one, so be sure to check it out.

Opening the lock is as simple as inserting the key and backing out the threaded lockbolt through the receiver. This tiny locking device is small enough to fit in your pocket but strong enough to save the contents of your entire trailer.

Maximum security comes at a cost, but InSite Solutions Equipment Lock BRHL Steel Ball And Ring Hitch Lock will put your mind at ease. This 3/8-inch steel security device is a universal design so it fits virtually all trailer hitches, whether you have a ball or ring style receiver.

With a bright red finish and a design that nearly envelops the receiver hitch, it will be clear to thieves that this trailer is off-limits. To keep your belongings safe while traveling, use any of these amazing luggage locks from our list.

Master Lock is a longstanding and trusted name in the security game. While the first trailer lock we featured may have been a robust option, we found a pared-down version that will get the job done… as long as you keep the trailer connected to your tow vehicle.

Built with longevity in mind, this Master Lock  2847DA Adjustable Coupler Latch Trailer Lock has a waterproof endcap to ensure moisture stays out and that the lock keeps functioning for years to come. For absolute peace of mind, make sure to have one of these keyless door locks for your home.

The only all-Chromoly lock on our list, the Master Lock 377KA Trailer Hitch Lock is universally designed for all trailer hitch variations. The advanced locking mechanism is resistant to picking. It’s also made with zinc to ensure rust doesn’t creep into the locking device’s inner workings. 

This simple trailer lock’s design fills the receiver hitch and locks the device via a steel pin, ensuring that there’s no chance for removal. For more reliable safety products, check out our buying guide on the best smart locks everyone is raving about.

Constructed from zinc, this Master Lock Universal Trailer Hitch Lock is a simple and effective way to protect your valuable cargo. While it’s only the size of a softball, this locking system offers big protection for your trailer by filling and covering the receiver tongue. This feature ensures that there is no way to hook up and tow off your tow-behind and its precious cargo. The Master Lock Universal Trailer Hitch Lock’s internal workings are also made from zinc, which will ensure that this device will work for years.