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Best Trailer Coupler Locks Reviews with Buyer’s Guide

Buying the best trailer coupler lock is surely top on any trailer owner’s priority list. And it’s very natural since trailers are easier to hitch up, steal and sell. Thieves lurk around trailers that aren’t secured firmly enough. So it’s necessary to secure your trailer with the best coupler lock.

Coupler locks are a petty investment that are able to save you a lot of hassle and heartache. The money you’ll spend on a trailer coupler lock is always a lot less than the cost of replacing a whole trailer. So it’s a wise idea not to risk an expensive trailer procrastinating buying a lock.

There are different types of trailer hitch lock and trailer wheel lock available in the market. In this article, I have handpicked the quality ones that are bestselling, most popular and cost-efficient. You’ll also find a brief buyer’s guide before I conclude. So let’s take you through them all.

REESE Towpower 72783 Universal Coupler Lock

Never risk your trailer for any further second with this universal coupler lock from Reese Towpower. This is the very bad news for the trailer thieves lurking around your trailer and RV. Surely they’re going to find it next to impossible to break this coupler lock, thanks to the super durable base and steel bar it comes with.

When you have this heavy duty lock, you don’t need to look further for another one in the market. The lock comes with superb adjustability.

You’ll get 11 (eleven) ratchet designed locking positions with to adjust it according to your preference.

And the adjustment is pretty simple to fit precisely. Couplers of 1-⅞”, 2”, and 2-5/16” are easily fitted into this lock.

The lock is constructed deftly enough to provide you with ultimate safety. The base is painted yellow for better visibility. It is definitely ideal for all the trailers. The lock is composed of advanced fortified materials that are resistant to picking, drilling or prying.

The tow hitch locking system is pretty simple and with its adjustable hoop, the installing is quite easy. For releasing the locking clamp, turn the key clockwise and clench it in its position then give the clamp and upward pull.


  • Part Number : 72783
  • Weight : 1lb
  • Product dimensions : 9 x 3 x 9”
  • Model number : 72783
  • Size : 1-⅞”
  • Color : Yellow and Chrome
  • Material : Steel

The greats

  • The locking bar is fairly adjustable
  • Intelligent painting ensures high visibility
  • Designed for universal fit
  • Resistant to rust or corrosion

The not so greats

  • The aluminum base isn’t strong enough

Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock

This outstanding trailer lock from Trimax is an excellent theft deterrent product for your trailer. Its design and build don’t quite match. The lock allows you to enjoy an improved security for the trailers. This deterrent features 360-degree hardened steel that eliminates any chances of easily breaking.

Take this safety lock along with your camping goods and the safety of your trailer, RV or boat is totally insured.

This lock features sleek nylon housing of ballistic grade.

Therefore, a first-rate coating provides the base with excellent protection from unwanted corrosion. Moreover, the keyhole features a cover that keeps the dirt and grime away. This guarantees that you never experience any jamming at all.

You may never have to look for locks that fit only particular trailers if you own one of these. This lock is universally compatible with almost every trailer and fits precisely with 1-⅞”, 2”, and 2-5/15” couplers. The lock fits any of the hitching couplers whatsoever.

This theft deterrent product comes with a dual ratchet hook feature that helps to protect trailers that aren’t hooked. It also offers a Trimax coupler lever lock for enhanced security. The lock weighs only 4.7 lbs and is simple in design. Therefore, its installation is pretty easier.


  • Model : Universal coupler lock
  • Weight : 4.7 lbs
  • Dimensions : 4 x 9.3 x 8.8 inches
  • Item model no : SS-SMS-4010235
  • Manufacturer Part Number : 4010235
  • OEM Part Number : UMAX100

The greats

  • Decent nylon housing resists impacts
  • Rugged body design
  • Innovative cover
  • Keyhole has a cover to keep out dirt
  • Universal fitment

The not so greats

  • A bit too pricey
  • Fits loosely on some trailers

Tow Ready (63228) 'Gorilla Guard' Coupler Lock

You may well take a closer look at this Tow Ready 63228 heavy duty Gorilla Guard coupler lock if you are eyeing an affordable and solid option. The product has a decent design that shields the lock from devices that tampers. It perfectly fits most of the 2” couplers. The company says that it works on coupler widths having a 3-13/16” or less diameter. It further says that the coupler lip’s height must be within 5/16 inches.

 I personally like this heavy-duty deterrent product. It will be next to impossible to steal a trailer that has this lock installed. Or at least it seemed to me.

The design and the build ensure it renders solid performance.

Keep your unattended trailer away from thieves with this superb deterrent. The thieves will find it a mountainous task to break the tough metal structure. They can go for hammers, drills or saws but it’ll be in vain.

The installation might seem to be a bit tedious task. But that’ll only matter a little once you have this installed. This rock-hard lock will keep you worry free. It has been designed to fit the ball socket of your trailer. The solid bar covers the coupler. The lock comes with two keys that ensure you have no trouble when you lose one accidentally.

The wide design helps it withstand any sudden impact. It is also effective to avert any tampering devices to gain access. For the price, this high-quality lock is the best hitch lock in the market. The only downside of this efficient product is the lack of compatibility with different coupler sizes.


  • Model : 63228
  • Weight : 2 lbs
  • Dimensions : 7 x 6 x 3 inches
  • OEM part number : DJSK63228

The greats

  • Comes with two keys
  • Full metal structure
  • Rock-hard and tough to break

The not so greats

  • Supports only 2-inch couplers

Master Lock - Universal Size Fit Trailer Locks

This Master Lock - Universal size fitting trailer lock is all that you need for the safety of your trailer. This perfectly built trailer lock offers you ultimate safety. This unique lock is universally compatible. Therefore, it eliminates any struggle searching for an ideal trailer lock. This theft deterrent system is able to lock couplers of sizes 1-⅞”, 2”, and 2-5/16”. The manufacturers kept its design unique. It's free of trials and errors. The heavy-duty lock is made of sturdy materials. They prove to be good enough to give the thieves pretty hard times. Also, its locking mechanism boasts extra-hardened steel. So, no more worries regarding prying, sewing or hammering. It won’t break loose.

When you look at the other features of this lock, the bright red color appears boldly. It is an important feature that deters the thieves from any tampering. It also prevents corrosion and rust while also protecting the lock in extreme weather conditions.

Installing this locking device on your trailer coupler is pretty simple a job. The overall structure emphasizes your trailer’s security and the ease you need for installation. The unique design never allows any other key to open it. It ensures the precise protection you’ll want for your trailer. So, make sure you never lose the key. Otherwise, you can quite get doomed.


  • Item model number : 389DAT
  • Weight : 2 lbs
  • Dimensions : 6.5 x 4 x 7.5 inches

The greats

  • Constructed with sturdy materials
  • Provides protection from damages caused by weather
  • Bright red paint deters thieves
  • Resists picking or prying

The not so greats

  • Extremely tough to open when you lose the key

Trimax 4010236 Umax50 Premium Die-Cast Dual Purpose Coupler Lock

This Trimax lock is designed in such a size and shape that fits all types of trailers. The excellent die-cast coupler lock is a dual ratchet locking system. Its innovative design provides you with 360-degree protection. The hardened steel has a rust and corrosion proof epoxy hammer tone finish. The lock is compatible with couplers of 1-⅞”, 2” to 2-5/15”. It features a cover for its keyhole that can slide up to keep the dirt or grime away.

The lock integrates a super solidified hardened steel structure. Therefore, it’s next to impossible to steal your trailer breaking this lock.

The receded edges provide a great defense against bar and sledge attack. The lock is has a coat made of decent materials that make it rust and corrosion proof guaranteeing superior durability. Its steel shackle has a diameter of ⅝”. It makes the lock tough to saw through. Its advanced mechanism is boosted with a 6-tooth design which makes it harder to pick. Supporting all types of couplers, the lock provides you with ultimate convenience.


  • Model : 4010236
  • Weight : 1 lb
  • Dimension : 3.9 x 8.9 x 9.1 inches
  • Item model number : SS-SMS-4010236
  • OEM part number : UMAX50

The greats

  • Super hardened steel
  • Epoxy hammer tone finish
  • Universally compatible
  • Comes with a keyhole cover

The not so greats

  • Not totally rust proof
  • Keys get jammed inside sometimes

Master Lock Trailer Lock, Trailer Coupler Lock, 377KA

This coupler lock from Master Lock is a great option for immobilizing your trailer till the next time you’re going to use it. Anyone without a key will find it a mountainous job to open this tough theft deterrent. The lock has a daring appearance to boast. And it renders excellent performance for keeping your trailer safe from thieves.

The product is built entirely of metal and hasn’t left a room for weaker materials. The thieves and robbers are going to sweat a lot to cut it or break it.

The outstanding sealing mechanism provides you with superb security for your trailer while you’re enjoying your camping activities.

The lock is incredibly compatible with a wide range of couplers. It can seal all the couplers with sizes 1-⅞”, 2” and 2-5/16”. Hence, this versatile coupler lock makes sure you never need to buy another lock when you buy a new trailer. The sleek body resists severe weather conditions. So you can quite guess the durability it may offer.

The product has a drawback though. It’s keyed alike, meaning they all use the same type of key. A thief can easily unlock it once he has access to one of the Master Lock keys. But as long as a thief hasn’t any access to a key, this is surely one of the hardest locks to break.


  • Model : 377KA
  • Weight : 2.2 lbs
  • Dimensions : 5.6 x 4.3 x 2.8 inches
  • Manufacturer part no : 377KA

The greats

  • Resistant to tough weather
  • Solid construction
  • Quick and simple installation
  • Universally compatible

The not so greats

  • Keyed Alike
  • Fits loosely on several applications

Master Lock 379ATPY Trailer Lock, Universal Trailer Coupler Lock

This 379ATPY trailer lock from Master Lock will bring you pleasure and confidence. Exceptionally securing your trailer, it will never allow your trailer to be exposed. It seals the trailer couplers firmly enough to make sure you enjoy better security. The lock is constructed with sturdy materials, unlike the cheaper locks. The materials used in it are fairly durable to avert cutting or prying. The lock is also able to prevent rust and corrosion. The lock keeps your trailer away from thieves and robbers.

Besides its super strength, the versatility of this lock is also noticeable. With its universal compatibility, the lock fits a wide range of trailer hitches.

It can fit any coupler within the sizes 1-⅞”, 2” and 2-5/16”. So people owning multiple trailers can easily seal them with the same lock.

The installation and removal of the lock are one of the simplest tasks in the world. This convenient and advanced mechanized lock is surely worth the money spent on.


  • Item model number : 379ATPY
  • Dimensions : 5.1 x 3.5 x 4.6 inches
  • Weight : 1 lb
  • ASIN : B000L9QRE8

The greats

  • Sturdy zinc alloy made
  • Super easy installation and removal
  • Fits multiple couplers

The not so greats

  • Suitable for only mobile trailers

Reese Towpower Adjustable Coupler Latch Lock 7042100

This adjustable latch lock for your trailer coupler from Reese Towpower is a great option among this list. It’s also a bit different than the rest. The solid structure has been formed with sturdy materials that come up with sublime confidence. The lock is reinforced with a steel shaft with nickel coat. Therefore, it’s a lock that is harder to pry or cut. The base of this quality coupler lock is made of brushed aluminum. Hence, it leaves no chance of corrosion or rust. Besides adding up to the durability, the brushed aluminum also increases the lock’s appearance. And you’ll be pretty convenient with a couple of keys the product comes with.

The lock offers the highest of the convenience. You can lock in 6 different positions. You can quite understand the ease it brings to fit the trailer latch. It’ll never make you struggle. Furthermore, the lock can be adjusted from ⅝” to 3”. Therefore, it smoothly gets the securing job done for most of the trailer couplers.

The lock is ideal if you’ve been looking for a lock with compatibility with a variety of couplers. It boasts a pin with a diameter of 3/16” that compatibilizes most of the couplers. The lock surely ranks among the best choices for the people with trailers.


  • Model: 7042100
  • Weight: 2.4 oz
  • Dimensions: 6 x 2 x 2 inches
  • Manufacturer Part no: 7042100
  • Material: Brushed aluminum

The greats

  • Designed to resist rust and corrosion
  • Smooth, shiny finish
  • Compatible with most of the couplers
  • Super lightweight yet sturdy
  • Easily adjustable

The not so greats

  • Weaker than steel made locks

Shoreline Marine Trailer Coupler Lock

If you’re looking for a simplistic deterrent solution for your trailer, this coupler lock from Shoreline Marine could be considered as a decent option. This small in size, lightweight brass made lock is super easy to use. You can install and remove it in no time. The design is bright and fully visible with shiny golden colored brass. The lock looks simple and works simple but the mechanism inside is truly impressive. You screw the key to unite the two units and unscrew it to separate them. But you can use it as simply as your regular padlocks. The lock never rusts or corrode.

A few complaints against this lock have popped up though. Some users have found their lock to open easily with their regular keys of the same size. Moreover, the keyhole gets jammed up so often and you may have to struggle to get the key inside. And even if you get the key inside, the screwing might be difficult as well.

Its relatively cheaper price is something that may assuage a buyer’s frustration. The lock works fine in adverse weather conditions. It may be considered as a fair enough solution for your not so expensive trailer.


  • Item model no : SL52300
  • Dimensions : 6 x 4 x 6 inches
  • Weight : 4.8 oz
  • ASIN : B004LR5NEG

The greats

  • Small in size
  • Lightweight yet sturdy
  • Fully bright and visible
  • Works in adverse weather conditions.
  • Rust and corrosion resistant

The not so greats

  • Keyhole gets jammed up so often
  • Doesn’t support that many couplers

Reese Towpower Trailer Hitch Coupler Lock 7006600

This one from Reese Towpower is a budget deterrent solution for your trailer coupler that provides you with safety and ease in a smaller size lock. This ordinary yet heavy-duty lock is all brass made. It has been designed deftly enough that protects your trailer from theft. The shiny brass helps it appear totally noticeable. It’s very important to fend off the thieves and thugs lurking around your trailer. It also helps it remain free of rust and corrosion. The durable coupler lock is hard to cut or hammer. The keyhole has no cover on it but still, it has been designed to block unnecessary dust from getting inside. This super lightweight coupler lock is easy to lock and unlock.

The reviews are positive in regard to the lock but frustrations have been expressed by the users regarding the keys. In some case, the lock is harder to open even with a key.

The name Reese itself represents a great value for this lock. It’s cheaper than most of the coupler hitch locks in the market. But it never fails to get the job done to secure your rarely used trailer.


  • Item model no : 7006600
  • Dimensions : 1.8 x 1.2 x 5.5 inches
  • Weight : 0.32 oz
  • Manufacturer part no : 7006600

The greats

  • Super lightweight yet sturdy
  • Small in size
  • Bright and easily noticeable
  • Fairly works in extreme weather
  • Fully corrosion and rust proof

The not so greats

  • Keys may stick while screwing

Best Trailer Coupler Lock Buying Guide

Buying a best rated trailer coupler lock is a tough task indeed. Some people don’t even bother to lock their trailer at all. They surely risk losing their trailer. And there are people who sweat a lot to buy the best lock for their trailer since thieves have become smarter than ever to break and steal weaker locks within minutes or even seconds. To ease your struggle with choosing the best trailer coupler lock, here I present you with a brief buying guide.

Hopefully, in the end, you’ll pick the exact lock your trailer needs for security. Check the facts below

Materials used

Check the materials of a lock before you check the design. Different materials have different levels of protection. Trailer locks are made of aluminum, steel, zinc, copper alloys and others. It’s necessary to check their ability to provide you the adequate security. The hardened steel provides the top class protection to your trailer. It makes sure you offer the security in most-risked areas to your trailer. But don’t just lock up your trailer and forget, take safety measures as well.


Size is an imperative feature to consider before buying a trailer lock. Bigger locks offer better set up without any problem. Moreover, most of them can be installed on various different trailers and they don’t require any force. The smaller locks, on the other hand, might need some force when they stick in couplers. So, I suggest, go for a lock that fits in the coupler precisely. It’ll come helpful especially in extreme weather conditions.


Do consider the inside locking mechanism. Some locks boast built-in mechanisms which is a nice feature saving you money. And, they add up to the overall strength as well. In most cases, they come along with hardened mechanisms. Other than this type, there are locks that use third-party clamps or padlocks. You can select either of the kinds. Furthermore, you can customize the safety of your trailer as well. In fact, these trailer locks can even provide the maximum security.


You can not just do without checking the compatibility of the lock before buying. Not all the hitch locks support all the trailer couplers. Don’t forget to measure the trailer hitch before you considering buying a lock. It’s helpful to determine the precise coupler lock for your trailer. Unfit locks will always add up to your frustrations and eventually, it’ll compromise your trailer’s safety. The good news for you is, the manufacturers are now producing locks that are universally compatible. They also recommend the range of couplers compatibility. So you can pick the suitable one real quick nowadays.

Durability in adverse weathers

You won’t store your trailer indoors. So it’s always likely that they’ll encounter critical weather conditions outside. So, locking a trailer with a lock that can resist tough weather conditions is a wise step to protect it. Make sure your trailer lock is constructed and designed with corrosion and rust proof materials so that the performance never tapers off with your trailer staying longer period outside.

Final Verdict

You cannot but secure your very own trailer and that’s why you need the best trailer coupler locks. It’s definitely not an option but a necessity. You must guard it with a suitable locking mechanism. We’ve discussed a range of quality locks above both expensive and cheap from which you can choose the one that suits your demand and budget. But whether you buy an expensive one or cheap, it’ll be a fair enough deterrent to put thugs off your trailer. Majority of those thugs eye hitch up a trailer and make a getaway. Any of the coupler locks we’ve recommended above is able to put them off and secure your trailer. So, just pick the right one as per our guide and go buy from shop you prefer. Secure your trailer today.

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