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How to Select the Best Trailer Hitch Lock

How to Select the Best Trailer Hitch Lock - CURTHow to Select the Best Trailer Hitch Lock - CURT

5 Steps for Selecting a Hitch & Trailer Lock

Selecting the right locks for your hitch and trailer requires thinking about your towing practices and needs. What size receiver does your vehicle have? How often do you tow? Do you own more than one trailer?

In this guide, we will lay out the best hitch locks and trailer locks CURT has to offer, and help you answer some of the important questions to consider when purchasing a towing lock.

Step 1: Match receiver and trailer tongue size

One of the first steps to selecting the best trailer lock or hitch lock for your towing setup is to know the hitch receiver size and trailer coupler size. The lock must be the right fit for the application.

For example, if the receiver measures 1-1/4” x 1-1/4” with a 1/2" hole, a 5/8" hitch lock will not work.

Start by measuring your receiver tube opening, the diameter of the hole in the side of the receiver, as well as the trailer coupler latch and / or ball size. Shop for locks within range of those measurements.

Fit Hitch Lock to Receiver SizeFit Hitch Lock to Receiver Size

Step 2: Consider frequency of use

Locking and unlocking your trailer is an added step that takes time. If extra security isn’t needed, a hitch lock or coupler lock may not be necessary. Instead, a hitch pin might be sufficient.

If you're frequently hooking up your trailer and need something to streamline the locking process, consider a lock that’s easier to access, such as a right-angle lock.

If you're planning to hook up once and leave your trailer connected for the duration of your trip, a higher security lock may be a wiser investment.

Easy Access Trailer Hitch Lock CylinderEasy Access Trailer Hitch Lock Cylinder

Helpful Hint: Most CURT hitch locks and coupler locks feature quarter-turn lock activation, making it easier to unlock using your key.


Step 3: Consider number of trailers / vehicles

The best lock for one trailer, might not be the best lock for two other trailers.

If you own more than one trailer, especially if they have different coupler sizes or styles, consider selecting a coupler lock that fits all of them equally. Some coupler locks are adjustable or even universal to fit virtually any type of coupler, making them easier to transfer between trailers.

If you own multiple vehicles, consider a hitch lock with an adapter. Depending on the receiver size, the best locking hitch pin may be one that works for both vehicles or separate locks may be needed.

Hitch Lock with Adapter SleeveHitch Lock with Adapter Sleeve

Step 4: Will you be leaving your trailer unattended?

For some applications, such as a quick trip to the dump, your trailer never needs to be uncoupled from your vehicle. In this case, a simple through-latch coupler lock may suffice.

However, for applications in which your trailer will be parked by itself and left alone, you may wish to enhance security. An over-lip trailer lock is one of the best trailer locking device options, inserting into the coupler opening so a trailer ball cannot be connected.

You can also improve security with an additional latch-style coupler lock as well as a wheel chock lock, maximizing theft-deterrence.

Wheel Chock Lock for Parked TrailerWheel Chock Lock for Parked Trailer

Step 5: Consider the conditions you’ll be driving in

Some locks are better-suited than others for long-term weather exposure. If you’re looking for some extra security for a trailer that’s always parked in the garage, a chrome-plated coupler lock will get the job done.

If you’re coupler lock will receive constant use and be exposed to a wide variety of outdoor elements – rain, snow, road grime, salt, sleet, UV rays – the best hitch lock choice is one made of stainless steel.

Towing Trailer in Bad WeatherTowing Trailer in Bad Weather

Best trailer hitch locks

Best 3-Lock Set Hitch Trailer - 23086Best 3-Lock Set Hitch Trailer - 23086

1. Most comprehensive

Three-lock set

Top Rated Hitch Lock - 23518Top Rated Hitch Lock - 23518

2. Highest rated

Black barbell-style lock

Best Hitch Lock for Ease of Use - 23504Best Hitch Lock for Ease of Use - 23504

3. Easiest to use

Blue anodized right-angle lock

Best Trailer Hitch Lock for Weather-Resistance - 23519Best Trailer Hitch Lock for Weather-Resistance - 23519

4. Most weather-resistant

Stainless steel barbell lock

Most Versatile Receiver Hitch Lock - 23021Most Versatile Receiver Hitch Lock - 23021

5. Most versatile

Deadbolt-style long-pin lock


Complete Hitch and Trailer Lock Set - 23086Complete Hitch and Trailer Lock Set - 23086

1. Most comprehensive: Three-lock set

The best lock for complete security of your towing setup is the three-piece hitch and coupler lock set #23086. This triad of locks allows you to secure your receiver hitch and ball mount, your trailer coupler while towing, and your trailer while it is left unattended.

The hitch lock in this set fits 2" receivers -- class 3, class 4 and most class 5 hitches. The coupler latch lock is extremely versatile, featuring a segmented pin to fit multiple latch spans. The over-lip coupler lock is great for deterring theft while your trailer is parked, and can be used in tandem with the latch lock for extra security.

Best Trailer Hitch Lock - 23518Best Trailer Hitch Lock - 23518

2. Highest rated: Black barbell-style lock

The black-finish version of our 2” barbell-style hitch lock #23518 is one of the top-rated hitch locks. It fits most class 3 to class 5 hitches and has a simple quarter-turn locking mechanism for convenient use.

This hitch lock is a barbell-style, meaning it has a simple, subtle profile to help further deter tampering. The keyhole is accessed from the side and is covered with a watertight cap to help protect the internal components.

Best Locking Hitch Pin - 23504Best Locking Hitch Pin - 23504

3. Easiest to use: Blue anodized right-angle lock

The right-angle hitch lock #23504 is one of the best hitch lock options when it comes to ease of use. The right-angle lock head provides ergonomic access when inserting the key, positioning the keyhole toward you instead of from the side. The head also swivels and rotates as needed to ensure easy access.

This hitch lock has a quarter-turn locking mechanism to avoid unnecessary twisting of your hand.

It has a 5/8" diameter pin and fits virtually any 2” or 2-1/2” receiver tube.

Most Weather Resistant Hitch Lock - 23519Most Weather Resistant Hitch Lock - 23519

4. Most weather-resistant: Stainless steel barbell-style lock

The stainless steel barbell-style hitch lock #23519 is one of the best locking hitch pin options for weather resistance. If you’re planning to tow often and expect your vehicle-trailer setup to be frequently exposed to the outdoor elements, a weather-resistant lock is key.

Stainless steel provides this lock with protection against corrosion, even in the face of rain, snow, sleet and more. It also features a watertight cap that goes over the keyhole, protecting the lock cylinder’s internal components from damaging elements and debris.

Longest Pin Hitch Lock - 23021Longest Pin Hitch Lock - 23021

5. Most versatile: Deadbolt-style long-pin lock

The deadbolt hitch lock #23021 fits virtually any receiver with a 2”, 2-1/2” or 3” opening. This makes it extremely versatile, being able to fit hitches on vans and crossovers, as well as the largest of pickup trucks. For any class 3, class 4 or class 5 hitch with a 5/8” pin hole, this lock provides a good fit.

The deadbolt receiver lock comes with a bent handle for security and an easier grip.


Best trailer coupler locks

Best 3-Piece Trailer Lock Set - 23086Best 3-Piece Trailer Lock Set - 23086

1. Most comprehensive

Three-lock set

Most Compact Trailer Coupler Lock - 23521Most Compact Trailer Coupler Lock - 23521

2. Most compact

Black padlock

Best Trailer Lock Shackle - 23659Best Trailer Lock Shackle - 23659

3. Best shackle style

Hammer-tone universal lock

Easiest Adjustable Trailer Tongue Lock - 23503Easiest Adjustable Trailer Tongue Lock - 23503

4. Easiest to adjust

Segmented right-angle lock

Most Budget Friendly Trailer Lock - 23022Most Budget Friendly Trailer Lock - 23022

5. Most budget-friendly

Brass-plated padlock


Best Trailer Tongue Lock - 23086Best Trailer Tongue Lock - 23086

1. Most comprehensive: Three-lock set

One of the best methods for locking up your towing setup is to not only lock your ball mount into your receiver hitch, but to also lock your trailer coupler onto the trailer ball. On top of that, adding another lock when your trailer is left unattended ensures maximum theft deterrence.

The three-lock set #23086 includes all three of these lock styles: a hitch lock, coupler latch lock and trailer tongue lock. The locks are conveniently keyed alike for one-key access, and they fit a wide variety of towing setups.

Best Compact Trailer Coupler Lock - 23521Best Compact Trailer Coupler Lock - 23521

2. Most compact: Black padlock

For a low-profile lock to secure your trailer, whether you're towing it or leaving it parked, the #23521 coupler lock is the best trailer lock.

This simple padlock-style trailer lock attaches to the coupler latch, the pin passing through the latch hole. It stops the latch from being engaged or disengaged, and its compact construction maintains subtle security.

This trailer padlock fits a latch span of 3/4" and a 1/4" diameter latch hole.

Best Trailer Locking Device Shackle - 23659Best Trailer Locking Device Shackle - 23659

3. Best shackle style: Hammer-tone universal lock

If you prefer to lock your parked trailer with a shackle-style trailer lock, the universal trailer lock #23659 is a strong choice.

This shackle lock mounts over the tongue of your trailer coupler, protecting it while it is parked and left unattended. The integrated ball fills the coupler opening, preventing a trailer ball from being inserted.

With its universal design, this trailer tongue lock fits most trailer couplers.

Best Adjustable Trailer Lock - 23503Best Adjustable Trailer Lock - 23503

4. Easiest to adjust: Segmented right-angle lock

If you own multiple trailers and prefer to have one lock between them, the right-angle lock #23503 may be the best coupler lock for you. It has a segmented pin, meaning it can be incrementally adjusted to fit virtually any span from 1" to 3".

This coupler lock also has a quarter-turn locking mechanism for easy key access, and its right-angle head ensures the keyhole is always facing toward you for ergonomic operation.

Best Trailer Lock on a Budget - 23022Best Trailer Lock on a Budget - 23022

5. Most budget-friendly: Brass-plated padlock

If you're interested in saving some money on your coupler lock purchase, the brass-plated padlock #23022 may be best coupler lock.

This simple, compact trailer lock offers extra theft deterrence and helps ensure the coupler lock remains engaged or disengaged, featuring a hardened steel pin.

This coupler lock fits a max span of 3/4" and has a 1/4" diameter pin.

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