Best Trailer Locks: Load & Lock

Matthew Guy
by Matthew Guy

Top 8 Best Trailer Locks

best trailer locks load lock

Yeah, it sucks these things exist. But it doesn’t matter what’s in the trailer— boxes of tools, camping equipment, or a Hemi ‘Cuda — it all makes a tempting target for the criminal element. This goes for camping trailers, too. A retailer near your author’s hometown has to deal with loss prevention more often than anyone would care to admit. After all, in most cases, the theft is as simple as a hitch-up-and-go.

In the same way The Club steering-wheel lock is used to simply provide a deterrent, rather than making your ride theft-proof, so do these hitch locks for trailers. For fun, go search up the Lockpicking Lawyer on YouTube. He’ll be referred to multiple times in this posts as LPL.

Still, if there are two units side by each, a thief will likely make off with the one that provides the least resistance to an easy payday. A person should still lock the doors on the thing or, if it’s a flat deck, find some other way to secure the valuables.

Meaning, of course, none of these are a total waste of money. Something is always better than nothing and we waded through a few different options so you don’t have to.

Table of Contents

1. Editor’s Pick: Reese Towpower Universal Coupler Lock

This is the editor’s pick because it’s the one your author uses on his own trailer. No, it isn’t the most expensive on our list, and a determined thief can defeat the thing with two quick zips of an angle grinder or ramset. Talented lockpickers like LPL can also gain entry. It is, however, an effective deterrent and easy to use. Its universal fit is good for many different hitch sizes.

A c-clamp style locking mechanism slides down over the hitch’s top while a spherical insert goes plugged into the business end of your trailer’s tongue. Push to lock, no key required. It does come with a pair of keys to unlock the thing. Personal experience has taught your author the c-clamp will rub against the trailer hitch, scraping off paint and causing surface rust. It’s not critical but is unsightly.


  • Affordable, easy-to-use, aluminum body and steel bar


  • Could be easily defeated by a determined thief

Bottom Line

  • A great deterrent

2. Master Lock 377KA Trailer Hitch Lock

Based on a heady 2,100+ reviews, this thing from Master Lock is the clear popularity king in the school of trailer locks (trailer locks, hard knocks, … no? Fine.) This unit is chrome plated and only weighs a couple of pounds. Unlike the Reese lock, this one fits into the trailer tongue in a horizontal fashion, making for a less intrusive look and avoiding paint rub.

It fits many different hitch sizes and allegedly will resist rust and corrosion when exposed to bad weather. Turning the key allows the shackle to slide toward the coupler, foiling casual thieves trying to make off with your tow behind. Our friend on YouTube severely dislikes Master Lock products but a 4.6 out of 5 star rating from buyers suggests this is ok for the average buyer.


  • Lightweight, horizontal installation


  • Chrome-like style may attract attention

Bottom Line

  • LPL would laugh heartily but the real-world reviews are positive

3. InSite Solutions Steel Ball and Ring Hitch Lock

Made of steel and weighing no more than a single pound, this lock might look bulky but it's found plenty of fans on Amazon garnering a 4.5 out of 5-star rating based on a decent sample size. The seller promotes this lock for use on equipment trailers - y'know, the type carrying zillion-dollar construction gear.

One reviewer claims to have defeated the lock itself with a shim (must've been watching LPL videos) while another said they had issues turning the cylinder in cold weather. Others describe it as 'a beast' and praise the manufacturer's decision to use 3/8" plate steel instead of light casting metal.


  • Fits several different hitch sizes


  • Expensive

Bottom Line

  • Weird looks but seemingly good protection

4. Trimax UMAX100 Trailer Lock

Anything with "solid hardened steel" in its title description earns this gearhead’s notice. One size should fit most couplers and, unlike others here, there is a cover for the keyhole to keep out debris and other nonsense that can scupper the lock’s use.

It is of the same design as your author’s Reese unit, which is to say it deploys a twin ratchet system that passes vertically through two parts of the lock. The body of the thing is painted an appropriate black, while the ratchet loop portion that swings over top of the coupling is chrome color. This means it’ll likely wear off some of the hitch’s paint over time. Keep a spray bomb handy.


  • Cheap insurance, stealthy appearance


  • Certainly not the cheapest one here

Bottom Line

  • Covered keyhole helps in foul weather

5. AMPLOCK Trailer Lock - 2" coupler only

This 5-pound brute isn't cheap but reviews seem to indicate that it may be worth the cash. Unlike others in this list, it has a center bolt-type feature that goes up where the hitching ball normally goes, while the rest of it grabs the coupler lip. Some customers reported frustration in mounting the thing (mind, gutter, etc) but other respondents were quick to jump in the comments and offer practical advice. Who knew there was a community for trailer locks?

This lock is good for a 2-inch only, meaning it'll fit common couplers like those on campers but small utility trailers might be out of luck. This means you’ll need to order the specific size for your trailer, so be sure you've selected the right one before hammering that 'buy' button.


  • Snug fit, not painted bright yellow


  • Costs well over a hundred bucks

Bottom Line

  • Make sure you get the correct size

6. Master Lock 389DAT Universal Coupler Lock

You guys and girls know that I’m a sucker for anything painted a bright color, even when it shouldn’t be. Trailer definitely fall into that category, as logic dictates it’s definitely better not to advertise the fact you’ve got a trailer worth stealing. The inclusion of another Master Lock in our list will surely raise LPL's blood pressure. But this is my post and I’m including it.

The business end of this lock goes pushed into the trailer’s coupler at which time the bid (red) shield is ratcheted forward to engage the whole works. It is a featherweight two pounds and is reasonably priced. Nearly 95 percent of customers gave it a four or five-star review, a development our LPL friend will surely find outrageous.


  • Good price, great reviews, it’s red


  • Ratchet style engagement, it’s red

Bottom Line

  • It's red

7. Tow Ready Gorilla Guard Coupler

Gorilla Tape is pretty good, but what about Gorilla Guard? The tape doesn’t matter, as it may share a name but is not made by the same company. What we can tell you is that this lock is built to protect a 2-inch ball, meaning it won’t have the wobble and shake of some universal units. Its design means it won’t fit all couplings, however, with the widest it’ll accept being a width of 3-13/16 inches and a height of 5/16 of an inch. It would not fit my trailer, for example.

For those of whom it will, this is not a bad option. Made of heavy duty material, this lock slides horizontally onto a trailer ball to scupper unauthorized hitching of an unattended trailer. One customer reports they were forced to leave their boat trailer on the street overnight. Upon inspection, it was revealed someone tried to hammer off the lock but was unsuccessful in doing so. That’s a pretty reassuring anecdote.


  • Tough enough to stand up to a hammer attack, slim design


  • That slim design means it won’t fit all trailers

Bottom Line

  • Good for 2-inch couplers only

8. CURT Powder-Coated Aluminum Trailer Tongue Lock

Powder coating usually shows up on exhaust parts and chassis frames, not trailer locks. Nevertheless, here it is, blasted onto a uniquely shaped lock made of aluminium sold by a recognized brand name that sells a ton of other trailer gear. This lock is good for 2- and 2 5/16- inch couplers, so it won’t shake loose on the common two-incher.

Sliding horizontally onto the trailer tongue, this lock prevents thieves from backing their tow vehicle up to your trailer’s hitching point and making off like a buncha bandits. By blocking off the portion of the tongue into which the truck’s hitch ball is placed (yay for double entendres!), it provides a good deterrent against the night shift looking for a five-finger discount.


  • You’ll be the only one at the campground with a powder coated lock


  • A surprising amount of bling

Bottom Line

  • Ensure fit before ordering

Notes on Trailer Locks and Trailering in General: It’s always good advice to park an unattended trailer in a well-lit area or in a locked place where the thing can be checked on frequently. No anti-theft device is perfect, of course, and all the manufacturers on this list have plenty of fine print about not being ultimately responsible for the loss of your toys.

Trailer Lock FAQs

What is the best hitch lock for a trailer?

Although you may have your preferences, a hitch lock that is categorized under the ‘Amazon’s Choice’ segment and is enjoying a 4.5-star rating from more than 14K users on Amazon, is:

CURT 23518 Black Trailer Hitch Lock ( Buy here!)

At the time of this writing, the lock is available for less than $22.5 and comes with a pair of keys.

A few other mention-worthy hitch locks are:

Master Lock – Universal Size ( Buy here!)

Reese Towpower 7088300 ( Buy here!)

How do I keep my trailer from being stolen?

You can try a couple of solutions if you are worried about the security of your trailer. The most obvious protective measures include various types of locks. A few locking systems that you may want to know about and buy if you find them suitable are:

• Hitch Pin Lock

This type of locking system ensures that the trailer is locked with your vehicle, thus making it hard for the thieves to tow it away when you are not around. You can also use the lock to prevent the latch from being used when your trailer is not attached.

• Tongue Lock

A tongue lock ensures that your trailer stays locked and cannot be stolen in your absence. Although some branded locks are made of good quality material, due to the traditional locking mechanism, these can be easily picked or broken if hit by a strong and heavy object.

• Alarm System

You may also consider using an alarm system to send you alert signals if someone tries to mess with your trailer. Many alarms nowadays have a built-in vibration feature for physically impaired people.

• Chock Lock

This prevents the tires of your trailer from moving, thus protecting it from thefts.

• GPS Tracking

GPS tracking system is one of the most advanced technologies today, and therefore it is highly recommended. However, you should install it smartly, i.e., at a place where it is not easily visible. This will enable you to inform the police or the relevant security agency about the theft without alerting the thieves.

In addition to the locking and alarm systems, a few tips to protect your trailer from getting stolen are listed below:

• Park your trailer at a safe place. A garage would be the best option. If you don’t have access to one, consider parking the vehicle in a well-illuminated area

• Mark your trailer with a unique symbol using a unique or rare color. Doing so makes spotting the vehicle easier for the police

What is the most secure hitch pin lock?

Categorized under Best Seller on Amazon with a 4.6-star rating from more than 5.5K users, CZC AUTO Hitch Receiver Pin Lock ( Buy here!) is considered the best in the segment.

Another one with a decent number of reviews on Amazon is the METOWARE Trailer Hitch Receiver Pin Lock ( Buy here!).

Do I need a coupler lock?

If you live in a theft-prone area, yes, you do need a coupler lock. A hitch pin lock is useful for both attached and unattached trailers.

• When Unattached

When your trailer is not attached to your vehicle, you can put the pin through the coupler pinhole and lock it. This prevents the thieves from using the latch to attach your trailer to their vehicle and tow it away.

• When Attached

You can even use a coupler hitch pin lock when your trailer is attached to the vehicle. This way, the thieves cannot detach the trailer from your automobile and attach it to theirs to tow it away.

From time to time, TTAC will highlight automotive products we think may be of interest to our community. Plus, posts like this help to keep the lights on around here. Learn more about how this works.

(Editor’s note: This post is meant to both help you be an informed shopper for automotive products but also to pay for our ‘90s sedan shopping habits operating expenses. Some of you don’t find these posts fun, but they help pay for Junkyard Finds, Rare Rides, Piston Slaps, and whatever else. Thanks for reading.)

[Main photo credit: Nattapon B / Product images provided by the manufacturer.]

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