Protect your trailer from theft with trailer coupler locks. These locks come in handy when you want to drive your tow vehicle separate from your trailer. At a jobsite and want to leave your trailer behind while you go to lunch or head out for a missing part? Or you’ve hauled your trailer to your campsite, but need to run out for supplies. Coupler locks allow you to secure your trailer while you’re away. Carhampt reviews a variety of trailer and coupler locks for a verity of fits and applications.

Best Overall
Master Lock - Universal Size Fits 1-7/8", 2", and 2-5/16" Couplers - Trailer Locks #389DAT
  • Universal coupler lock fits virtually all 1-7/8", 2", and 2-5/16" trailer couplers.
  • Bright red finish discourages thief's from messing with your trailer.
  • Resists rust and corrosion. Simple installation and removal.
  • Advanced locking mechanism resists picking and prying.
  • We can NOT key two (2) of these locks the same. The similar 379KA coupler locks are available keyed alike. The only difference between this one (389DAT) and the 379KA is the color.

I highly recommend this lock. Fits snug and tight. Easy to use. Relatively inexpensive for the security it provides.

Secure Trailer Coupler Locks

Trailer Coupler LockYou’re protecting important equipment – and you want peace of mind that your go-to gear is safely stowed. Choose from an assortment of trailer locks for worry-free performance. The straightforward ease of lock-and-key options provides you or a few trusted others access to gear, while cable locks with combinations eliminate the need for a key and just require a simple number code.

Durable Trailer Couplers

Built tough and made from strong materials, best trailer coupler locks utilize rugged construction to help ensure lasting use. Stainless steel stands up to the elements, while specially built keyway covers help prevent moisture and dirt from entering. If you choose cables, vinyl coatings minimize scratching, while flexible steel is resistant to cutting for a touch of added security.

Trailer Couplers To Fit Your Gear

Worried about finding the right trailer locks to work with your gear? No need for concern – there is a wide variety of options to fit most equipment. Adjustable cables are ideal for bicycles, generators, ladders, gates and toolboxes. Open-style safety chains are great for towing, and are required by many states, so check local regulations to see just what you’ll need to stay compliant. For even more choices, check out a multitude of coupler locks, receiver locks and hitch locks to secure your trailer.

REESE Towpower 72783 Universal Coupler Lock, Adjustable Storage Security, Heavy-Duty Steel, Yellow and Chrome
  • DIMENSIONS: 9” x 9” x 3”
  • BUILT TO LAST: The REESE Towpower Universal Coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar.
  • UNIVERSAL FIT: Ratchet design is adjustable with 11 locking positions and fits 1-⅞”, 2”, and 2-5/16” couplers.
  • DETERS THEFT: Bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers.
  • SECURE PROTECTION: Easy-to-install lock resists picking, prying and drill outs. Guards against truck or trailer towaway theft in storage.

This REESE Tow power universal coupler lock prevents theft and keeps your trailer secure. The bright, yellow color is highly visible and deters theft. It features a ratchet design with 11 locking positions for versatility, and is designed to fit 1-7/8 in., 2 in., and 2-5/16 in. couplers.

Trimax "The Ultimate Universal Solid Hardened Steel Unattended Trailer Lock UMAX100, Clam Packaging
  • TRIMAX Corporation is the world’s leading lock manufacturer providing customers’ high quality products through innovative design
  • One size fits all (from 1-7/8", 2", to 2-5/16", all coupler types)
  • Key hole cover slides up to seal out dirt and grime
  • Attractive ballistic grade nylon housing absorbs hammer blows and protects against weather
  • Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break.

360 degrees of solid steel protection against trailer theft. The UMAX100 is constructed of solid hardened steel and fits most coupler sizes (1 7/8″ to 2 5/16″). A 5/8″ (16mm) hardened steel shackle helps ensure your trailer is secure, even when left unattended. It has a patented dual locking system, hardened steel crossbar and ball, and ballistic grade nylon housing for maximum security

Master Lock 379ATPY Universal Trailer Hitch Lock
  • Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
  • Trailer lock is best used for vehicles, trailers, and RVs
  • Trailer coupler lock features advanced locking mechanism to resist picking and prying
  • Trailer hitch lock is constructed from zinc to resist rust and corrosion
  • Includes one trailer coupler lock, two keys

Protect your unattended trailer with one of these Master Lock universal trailer coupler locks. They feature an advanced locking mechanism that resists picking and prying. The locks are also easy to install and remove, and will stand up to the harsh elements.

Master Lock 377KA Trailer Hitch Lock, Fits 1-7/8 in., 2 in., and Most 2-5/16 in. Trailer Couplers, Chrome
  • Trailer hitch lock fits 1-7/8 in. (48mm), 2 in. (51mm) and most 2-5/16 in. (59mm) trailer couplers
  • Trailer lock is best used for vehicles, trailers, and RVs
  • Trailer coupler lock features advanced locking mechanism to resist picking and prying
  • Trailer hitch lock is constructed from zinc to resist rust and corrosion
  • One trailer coupler lock, two keys
Tow Ready (63228) 'Gorilla Guard' Coupler Lock for 2" Couplers
  • Design shields lock from tampering devices
  • Fits most 2 inch trailer couplers
  • Coupler width (including lip) cannot exceed 3-13/16 inches
  • Height of coupler lip cannot be greater than 5/16 inch
  • No wrench or special tools needed
Reese Towpower 7014700 Tow 'N Store Lock Kit
  • Designed to provide excellent towing
  • Lockable offering extra safety
  • Includes swiveling clip
  • Includes swiveling clip
  • Easy to install
AMPLock U-BRP2516 RV/Trailer Coupler Lock (fits 2 5/16 inches Coupler)
  • Molded to fit the specific shape of your trailer or Caravan (RV) 2 5/16 inches coupler when unhitched
  • Materials used by AMPLOCK provide good rust resistance for use in all climates
  • Easy to use with AMPLOCK’s push and lock system
  • The strongest lock to secure your trailer or caravan (RV) made with high quality materials and control and identification key system
  • Protect your trailer or caravan (RV) without worries with the best coupler lock on market **Make sure you choose the right model for your trailer or caravan (RV) coupler size and type, referring to pictures provided (photos are for visual reference only) or to our website **
Fastway Fortress 86-00-5015 Maximum Security Universal Coupler Lock for 1 7/8 Inch, 2 Inch and 2 5/16 Inch Couplers
  • Fits virtually all 1-7/8”, 2”, and 2-5/16” tongue type trailer couplers to prevent your trailer from being stolen.
  • Two barrel-style keys included. This style of locks are harder to pick and much safer than others.
  • Anti-drill lock design.
  • Limited Lifetime Warranty
  • Unique shackle shape designed to prevent the lock from being pried off your trailer.
Trimax Stainless Steel Coupler Lock (Fits Couplers with Up to 2 1/2" Span) SXTC2, Clam Packaging
  • TRIMAX Corporation is the world’s leading lock manufacturer providing customers’ high quality products through innovative design
  • Country of Origin: CHINA
  • Item Package weight : 0.295 kilograms
  • Package Dimension : 1.27 centimeters L x 11.43 centimeters W x 22.86 centimeters H
Master Lock - (3 Keyed Alike Universal Trailer Coupler Locks 379KA-3
  • This is a set of 3 Keyed Alike trailer coupler/tongue locks and is ideal when needing multiple locks that utilize ONLY one key. The same key opens all three locks. Each lock comes with two keys, therefore you will receive a total of six keys with the purchase of this 3 pack. Limited Lifetime warranty.
  • These locks protects unattended trailers and guards against tow-away theft. The universal trailer coupler lock fits 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) couplers by Reese, Fulton, Valley, Atwood, Shelby, Putnam, Hammerblow, Dutton, Lainson, and UFP.
  • This simple design is difficult to defeat because when it's locked on the trailer the lock rests on top of the coupler (see image) thus thwarting blunt force from downward hammer strikes. It also rotates (less rigidity) making it harder to break with sledge hammer force.
  • Rekeyable cylinder for keyed alike convenience with an advanced locking mechanism that resists picking and prying. Each lock weighs 2.4 lbs. and is simple to install and remove.
  • Made with Reinforced Zinc Die-Cast resists rust and corrosion. Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminium alloys, plastics, and grey cast iron. Zinc alloys offer high strengths (to 60,000 psi) and superior elongation for strong designs and formability for bending, crimping and riveting operations.
Master Lock - 3-1/2" Long Shackle x 9/32" Diameter Pin, Coupler Latch Lock - Trailer Locks 1471DAT
  • This Master Lock protects and guards against tow-away theft. The lock works when the trailer is either connected to the tow vehicle or when the trailer is unattached. The lock prevents the coupler latch from moving, therefore preventing either the coupler to be removed from the ball, or not allowing a ball to be placed into the coupler.
  • Fits UFP and surge brake couplers.
  • Pin length or dimensional fit is 3-1/2" wide with a 9/32" diameter pin which is a standard size on virtually all couplers.
  • Chrome plated for improved wear and corrosion resistance. It has a precision 4 pin tumbler mechanism that resists picking
  • Weather Tough seal and water tight cap protects the lock from the elements


What is the best trailer coupler lock?

Master Lock – best trailer coupler lock 2019. Otherwise, I didn’t see many issues being reported about this product. Therefore, if it meets the measurements of the lock you need as it does for me, I don’t see another reason why you shouldn’t at least consider this item from Master Lock.

How do trailer locks work?

Hitch locks help protect your cargo by fusing your trailer hitch and receiver together, preventing thieves from making off with your stuff. … Hitch locks are designed to stop thieves from stealing your trailer. A hitch lock keeps your trailer hitch and the receiver together until you unlock it, often with a key.

How do I keep my trailer from being stolen?
How to keep your troop trailer from getting stolen
  1. Purchase a wheel lock. …
  2. Block the doors. …
  3. Don’t store any gear inside. …
  4. Paint the top of your trailer. …
  5. Think before you park. …
  6. 6. Make friends in high places. …
  7. Get insured. …
  8. Go incognito.
How do you unlock a locked hitch?

To unlock and remove the end of the hitch Lock part # e98880 you will need to insert the key into the lock core and then start turning the key counter clockwise to un-screw the end section of the lock from the rest of it. To see exactly how this is done check out the video I attached

How do you put a coupler lock on a trailer?

Do trailer couplers wear out?

You will see the tongue, it rests under the bottom edge of the ball when the trailer is secured to the tow vehicle. Over time, the ball will eat away at the top of the coupler on the inside. Using grease on your ball will slow the wear, but won’t end it. As the wear continues

How does a Reese coupler lock work?

The Reese Towpower Universal Coupler Lock works on trailers with 1-7/8, 2 or 2-5/16 inch couplers. The locking bar fits over the nose of the coupler to secure lock in place, while the ball sphere fits into the ball socket of the couplerLocking bar inside width is 3 7/8 inches.