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Best Trailer Hitch Locks: Deter Thieves and Protect Your Possessions

These products are effective and essential when you leave your trailer unattended.

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BYNoelle Talmon/ LAST UPDATED ON June 6, 2022

You're baiting a thief if you leave an unlocked trailer unattended. It doesn't take much effort for a person to hook the trailer up to his vehicle and drive off with your equipment. Fortunately, a trailer hitch lock does a great job of preventing this from occurring. These devices make it much more challenging for a thief to steal your stuff. Many hitch locks are designed in bright colors that are visual deterrents and essentially a red flag to anyone who comes across your trailer with the intention of taking it. Instead of worrying about someone driving away with your trailer and its contents, get some peace of mind by using one of the following trailer hitch locks.

Best Overall

Master Lock Universal Size Trailer Locks

Summary
This trailer coupler lock comes with an advanced locking mechanism. Master Lock fits this universal trailer lock with a detailed design that resists picking and prying from tools and other equipment.
Pros
  • The bright red finish makes it stand out,
  • The lock is resistant against rust and corrosion, so leaving it outdoors in the elements won’t harm its locking mechanism
Cons
  • The lock can be a bit loose on some hitches
  • The locking mechanism can freeze up in extreme cold, making it difficult to turn the key 
  • It is on the more expensive side
Best Value

Cocoweb Chrome C-Lock Heavy Duty Locking Hitch Pin

Summary
Cocoweb’s chrome C-lock easily slips into the fastener hole, keeping the hitch securely linked with the frame of your vehicle. The metal is weather-resistant, and the keyhole cover protects the keyhole from filling with water, grime, and rust.
Pros
  • The lock comes with a barbell locking mechanism for an extra layer of security
  • The design makes it fit more snugly and tightly to your hitch.
  • It comes with two sets of laser-cut keys.
Cons
  • The lock won’t fit anything smaller than 2.75 inches.
  • While it comes in two finishes, neither one stands out from afar as a visual deterrent against theft
Honorable Mention

Reese Towpower Universal Coupler Lock

Summary
This lock is constructed with an aluminum body and heavy-duty steel lock bar. It comes with a ratchet design, making it capable of being adjusted to 11 different locking positions.
Pros
  • The durable design of the locking mechanism is equipped to resist picking from lockpicks or other tools
  • The metal shell fights against prying and drilling
  • The design is able to withstand the effects of rust and corrosion
Cons
  • It may not fit all specific hitches properly
  • It may need a bit of adjusting to fit snugly onto most hitches
Best Trailer Hitch Locks: Deter Thieves and Protect Your Possessions

Summary List 

Honorable Mention: Best American Made: Proven Industries Model 2516 Trailer Lock

Why Trust Us

Our reviews are driven by a combination of hands-on testing, expert input, “wisdom of the crowd” assessments from actual buyers, and our own expertise. We always aim to offer genuine, accurate guides to help you find the best picks.

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Our Methodology

We took several factors into consideration when compiling our list of the best trailer hitch locks. First, we made sure to include products from reputable companies known for producing high-quality products. This includes manufacturers such as Master Lock, which has been making padlocks and security products for over a century. We also included different types of hitch locks, so there are different options to suit different needs. Our list includes products in a range of prices to fit a range of budgets. We also spent a good amount of time consulting user feedback to see how these devices perform in real-world conditions so we could determine which ones performed the best in all types of weather and conditions. More information about our methodology can be found on The Drive’s Gear About page.

Best Trailer Hitch Lock Reviews & Recommendations

Specs

  • Brand: Master Lock
  • Fit: Most 1 7/8-inch, 2-inch, and 2 5/16-inch trailer couplers
  • Type: Coupler lock

Pros

  • Universal fit for most hitches
  • Bright color repels thieves
  • Corrosion-resistant
  • Pick- and pry-resistant

Cons

  • May be loose on some hitches
  • Locking mechanism may freeze in extremely cold temperatures
  • Pricey

This universal coupler lock is designed to fit any type of trailer hitch easily and securely. That includes all 1 and 7/8", 2", and 2 and 5/16" trailer couplers. Plus, its bright red finish makes it stand out, discouraging thieves from getting near your cargo. Another benefit is the lock is corrosion-resistant against rust, so leaving it outdoors in the elements won’t harm its locking mechanism.

One feature we found particularly beneficial is the advanced locking mechanism included inside of the coupler. Master Lock fit this universal trailer lock with a detailed design that resists picking and prying from tools and other equipment. This also means it can only be opened by the set of keys included with the lock. Even if someone has another Master Lock trailer lock, his or her key will not work on your lock.

Outside of its tough design, lock system, and flashy red color, the lock can be a bit loose on some hitches. However, this may be due to its universal design to fit a number of trailer hitches. Another downside is the locking mechanism can freeze up in extreme cold, making it difficult to turn the key. Also, it is on the more expensive side when it comes to trailer hitch locks.

Specs

  • Brand: Cocoweb
  • Fit: 5/8-inch hitch receiver
  • Type: C Lock

Pros

  • Durable
  • Fits most hitch receivers
  • Easy to use
  • Weather-resistant

Cons

  • May not work properly with hitches smaller than 2.75 inches
  • Does not have a bright-colored finish to deter theft

This durable pin lock is designed to fit most modern hitch receivers around today. It easily slips into the fastener hole, keeping the hitch securely linked with the frame of your vehicle. The metal is capable of withstanding all types of weather conditions, making it resistant to rain, snow, and ice, plus the rubber cap protects the keyhole from filling with water, dirt, and rust.

The lock itself comes with a barbell locking mechanism for an extra layer of security. The design helps make the lock fit more snugly and tightly to your hitch. Another added benefit is the lock comes with two sets of laser cut keys, so you will have a spare in case one goes missing or you leave it behind.

While it may be able to fit any standard class I, II, III, and IV hitches, you may find trouble with the width of the hitch. It will not be able to fit into anything smaller than 2.75 inches. Also, even though it does come in two finishes, neither one stands out from afar as a visual deterrent against theft.

Specs

  • Brand: Reese
  • Fit: 1-7/8”, 2-inch, and 2-5/16” couplers
  • Type: Coupler lock

Pros

  • Heavy-duty construction
  • 11 locking positions
  • Bright yellow color is a deterrent
  • Easy to install

Cons

  • While marketed as a universal fit, it may not fit certain hitches

Reese’s premium universal coupler lock is constructed with an aluminum body and heavy-duty stainless steel lock bar. The lock’s ratchet design makes it capable of being adjusted with 11 different locking positions to suit your needs. The lock’s vibrant yellow finish makes it easy to spot from a distance to deter anyone who may want to get away with your cargo.

It provides secure protection with its easy-to-install design. The durable locking mechanism is equipped to resist picking from lockpicks or other tools, while the metal shell fights against prying and drilling. Another benefit is the design is able to withstand the effects of rust and corrosion.

The term universal may be a bit of a stretch for this coupler lock. Many consumers report it does not properly fit their specific hitch. You may want to check your hitch and compare it with this lock to see if it is compatible. It may also need a bit of adjusting to fit snugly onto most hitches.

Specs

  • Brand: Trimax
  • Fit: 1 7/8-inch, 2-inch, and 2 5/16-inch couplers
  • Type: Coupler lock

Pros

  • High-quality construction
  • Durable and built to last
  • Key hole is covered to prevent weather-related intrusion

Cons

  • Housing is plastic, not metal
  • May feel loose on two-inch couplers

The Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock is a great option because it fits all coupler types from 1 and 7/8 inches to 2 and 5/16 inches.

Weighing six pounds and made from high-quality materials, this trailer lock features a ballistic-grade nylon housing that is designed to absorb impact and provide protection in all types of weather. It is also constructed to resist drill-out attempts. The rugged, durable, seven-pin key is spring loaded and built to last, while the key hole cover has a cover to prevent dirt, grime, and water from intruding.

Users like its beefy construction and its ability to hold up to most types of attacks from would-be thieves. There have been some complaints about the housing being plastic, not metal. Also, due to its universal fit, the lock is a little loose on a two-inch coupler.

Specs

  • Brand: Master Lock
  • Fit: 1 1/4-inch and 2-inch receiver tubes
  • Type: Swivel head receiver lock

Pros

  • Two pins and keys included
  • Corrosion-resistant
  • Head rotates 360 degrees
  • Cover keeps dirt and moisture out

Cons

  • Rubber cap may fall off too easily
  • May rust shut if left on a trailer for prolonged periods of time

The Master Lock 1/2 in. and 5/8 in. Swivel Head Receiver Lock comes with two pins, two keys, and a locking swivel head. The chrome-plated, corrosion-resistant, hardened steel pins resist cuts and shearing. The 5/8-inch pin fits two-inch receiver tubes (Class III and IV) and is rated up to 10,000 pounds, while the 1/2-inch pin fits 1-1/4-inch receiver tubes (Class II) and is rated up to 3,500 pounds.

The locking swivel head rotates 360 degrees and has a push-to-lock locking mechanism for security. Simply push the head firmly onto the pin, and take the key out. The lock has a snap-on cover to keep dirt and moisture out, while the four-pin cylinder is an extra layer of protection against attacks. Master Lock also provides a limited lifetime warranty should you experience any issues.

One problem is that the rubber cap doesn't stay on very well and may not protect the lock barrel as well as it should. Also, the device may rust shut if you leave it on the hitch for a prolonged period of time.

Specs

  • Brand: Proven Industries
  • Fit: 2 5/16-inch couplers
  • Type: Coupler lock

Pros

  • Heavy duty
  • Hardened steel construction
  • Made in America

Cons

  • Expensive
  • Fits only specific couplers
  • Puck lock may need to be replaced

While a little on the pricey side, the Proven Industries Model 2516 Trailer Lock is secure, well made, and easy to use. It's more heavy duty than many competing brands, and it instills confidence in its users due to its tough construction. The lock fits certain 2 5/16-inch trailer couplers, is made from hardened steel, and is available in a variety of colors. The cover is designed to withstand abuse from crowbars, power tools, and hammers.

It's difficult to pick the lock due to its innovative design and interior locking mechanism. We also like that the lock is manufactured in America. One downside is that it only fits specific couplers, so make sure to check that it's compatible with your trailer's coupler before making a purchase. Also, you may need to replace the puck lock part of the assembly because it isn't the best quality.

Specs

  • Brand: Curt
  • Fit: Compatible with 2-inch hitch receivers
  • Style: Barbell

Pros

  • Prevents thieves from stealing hitch receivers
  • High-quality steel construction
  • Corrosion-resistant

Cons

  • May rattle
  • Can be a little bit of a hassle to unlock

The Curt Black Trailer Hitch Lock is a great option if you're looking for an item that prevents people from stealing hitch receivers. Constructed of high-strength steel, this device provides a secure, tight fit and involves 1/4-turn lock activation, which makes it fairly simple to use. It features a 5/8-inch diameter pin and is compatible with two-inch hitch receivers with a 5/8-inch hole. It does not work with double-walled receiver tubes, however.

The lock includes a watertight dust cap that keeps the elements out. It's painted in a powder-coat finish and is corrosion-resistant. Two keys come with the device, so you have an extra in case you misplace the first one. The lock may be a little challenging to close, but overall it works well to keep thieves from running off with your receiver. For added security, use a coupler lock as well to prevent the trailer side of your rig.

Our Verdict

Our pick for the best overall trailer hitch lock is the Master Lock Universal Size Trailer Lock because it’s designed to fit most types of hitch couplers, and its red color makes it stand out to deter thieves. For a more budget-friendly option, consider the Cocoweb Chrome C-Lock Heavy Duty Locking Hitch Pin.

Consider Secondhand

When we start shopping for tools and products, we never overlook the secondhand market. In fact, it’s usually the first place I look. Whether you’re scrolling through Amazon’s Renewed section, eBay for car parts or tools, or flipping through the pages of Facebook Marketplace and Craigslist, you have hundreds of thousands of used tools, parts, and gear ready to be shipped to your doorstep. Refurbished to like-new status, they’ll be willing to give you many more years of faithful service all while saving you money. 

If those options don’t have what you need, your local salvage yard is great for car parts, while swap meets are a great resource you should tap. Just Google either and head on down.  

Secondhand Tips

To make your secondhand search easier, here are two tips for finding the best deals and making sure your new-to-you stuff wasn’t destroyed by the previous owner. 

  • If possible, inspect the lock to make sure it’s in good working condition and that the elements lock and unlock smoothly. 
  • Avoid trailer hitch locks that are rusted because they may not work properly.

Things to Consider Before Buying a Trailer Hitch Lock

Key Features

Materials

Check out the type of material used on the lock. The majority are developed with a strong metal while others are reinforced with a tough steel construction. Either will ensure anyone looking to steal your trailer has a much more difficult time doing so. A strongly built lock will resist being broken.

Fit

While not all hitches are the same size, the best trailer hitch lock should be able to fit the majority of modern hitches. To make sure a lock will fit your specific hitch, double check with the manufacturer’s guide to see the exact specifications of the hitch.

Visibility

One of the best ways to help prevent the theft of your trailer, boat, or RV is to make sure you have a visible lock on the hitch. A good way to deter thieves is to get a bright color lock or a large one that is easily spotted from a distance; colors such as red or yellow are the most common. 

Types

Coupler Lock

A coupler lock is the most common of all trailer locks. It fits over the couple on the trailer’s tongue. This prevents anyone from hooking up a vehicle and driving off with your trailer.

Pin Lock

This type of lock works by sliding into the fastener hole where the hitch meets the frame of your vehicle. Some are bent at the end to add an extra layer of security for anyone trying to force it out of the hitch.

Trailer Hitch Lock Pricing 

A good variety of trailer hitch locks are affordable and cost less than $30. They can be anything from pin locks to coupler locks and are typically made of durable metal materials. More expensive hitch locks tend to be more rugged and longer-lasting. Some include additional locking mechanisms for added security.

FAQs 

You’ve got questions. The Drive has answers.

Q: What’s the advantage of using a trailer hitch lock? 

A:  They are a visual deterrent to thieves and, while they're not 100 percent foolproof, they can be challenging to remove without a key. They also provide peace of mind when you leave your trailer unattended, so you can lessen your anxiety.

Q: How do I install a trailer hitch lock? 

A: That depends on the type of lock you use. You should follow the manufacturer's instructions. You must disconnect your trailer from the tow vehicle and lower its front wheel or post. Then you must place the lock in the space where you would install the ball of your vehicle's hitch. Once you make sure everything is aligned, lock it in place.

Q: What is the best type of trailer hitch lock to use?

A: Since it can take a bit of time to lock and unlock a trailer, consider the circumstances. A hitch pin is appropriate if you don't need extra security. A right-angle lock is helpful if you regularly lock your trailer because it's simple to access. If your trailer will be unattended for an extended period of time, a higher security lock is a better bet.

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