Best Adjustable Trailer Locks

Looking for the best adjustable trailer locks to secure your valuable equipment? We’ve tested and reviewed the top 10 options, offering you a comprehensive guide to find the perfect lock that combines strength, durability, and peace of mind.

Securing your trailer is a top priority for any owner. With the right adjustable trailer lock, you can keep your valuable equipment safe from theft. We’ve tested and reviewed the best options to help you choose.

From heavy-duty steel to weatherproof designs, these locks offer maximum protection. They fit various coupler sizes and are easy to install. Whether you own a dump trailer or an RV, there’s a lock for you.

Discover the top picks that combine strength, durability, and peace of mind. Let’s find the perfect lock to keep your trailer secure.

List of Top 10 Adjustable Trailer Locks

Title	Best For	Price
S5 Coupler Locks Demco 2-5/16″ Adjustable Coupler Lock (LCS002 Demco) – Custom Fit for Dump and Equipment Trailers with C-Channel Mounts. (Includes Trimax Puck Lock)	This S5 Coupler Lock is perfect for anyone who owns a dump or equipment trailer with a Demco 2-5/16” adjustable coupler. It’s ideal for those who want maximum security and a custom fit to protect their trailer from theft.	View on Amazon (paid link)
TowWorks 79852 Keyed Alike 5/8″ Trailer Hitch Lock Set for Adjustable Channel Mounts, Double Safety Heavy Duty Tow Hitch Receiver Locking Pins fit Class III – V Hitches	This TowWorks 79852 Keyed Alike Trailer Hitch Lock Set is perfect for anyone towing trailers with adjustable channel mounts. It’s ideal for Class III to V hitches, offering double safety and a heavy-duty design to keep your setup secure and rattle-free.	View on Amazon (paid link)
MaxxHaul Trailer Tongue Coupler Lock – Adjustable Trailer Tongue Pin, 1/4″ Diameter, Fits 1″ to 3″ Latch-Type Coupler for RV, Truck Towing	The MaxxHaul Trailer Tongue Coupler Lock is perfect for anyone who tows trailers, boats, trucks, or RVs. It’s easy to use and keeps your trailer secure in all weather.	View on Amazon (paid link)
Tevlaphee Wheel Lock Set,Trailer Security Adjustable Anti Theft Trailer Wheel Lock for Car Camper Trailers SUV Boat Motorcycle Great Deterrent 2 Packs 6 Alike Keys	This Tevlaphee Wheel Lock Set is perfect for anyone who wants to protect their vehicle. It’s great for car, camper, SUV, boat, or motorcycle owners looking for strong and easy-to-use security.	View on Amazon (paid link)
Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT	This Master Lock Trailer Lock is perfect for anyone who needs a strong and reliable way to secure their trailer. It’s easy to install and use, making it great for busy people who value safety and convenience.	View on Amazon (paid link)
Reese Towpower 7042100 Adjustable Coupler Latch Lock , Black	This Reese Towpower Adjustable Coupler Latch Lock is perfect for anyone who owns a trailer and wants to keep it safe. It’s easy to use and fits most trailers, making it a must-have for peace of mind.	View on Amazon (paid link)
METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock for Towing Trailer Security Fits 1-7/8″,2”, 2-5/16″ Coupler Yellow	This trailer coupler lock is perfect for anyone who owns a trailer. It’s easy to use and works with most coupler sizes, keeping your trailer safe and secure.	View on Amazon (paid link)
REESE Towpower 72783 Coupler Lock, Adjustable Storage Security, Heavy-Duty Steel, Yellow and Chrome ( Universal Fit)	This REESE Towpower Coupler Lock is perfect for anyone who owns a trailer or truck. It’s easy to use and keeps your vehicle safe from theft.	View on Amazon (paid link)
RETRUE Universal Coupler Lock Trailer Locks Ball Hitch Trailer Hitch Lock Adjustable Security Heavy-Duty Steel Fits 1-7/8 Inch, 2 Inch, 2-5/16 Inch Couplers, Bright Yellow, Light Weight	This RETRUE Universal Coupler Lock is perfect for anyone who owns a trailer. It’s easy to use and fits most couplers, keeping your trailer safe and secure.	View on Amazon (paid link)
S5 Coupler Locks Heavy-Duty 2-5/16″ RAM Adjustable Coupler Lock (LCS002 RAM) – Custom Fit for C-Channel Mounted Equipment & Dump Trailers, Made in USA, (Includes Trimax Puck Lock)	The S5 Coupler Lock is perfect for owners of dump trailers and C-channel mounted equipment. It’s easy to install and keeps your trailer secure.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Adjustable Trailer Locks, carefully selected for maximum security and durability. Each lock is expert-reviewed and customer-approved, ensuring you find the perfect fit for your trailer. Whether you need heavy-duty protection or easy installation, this guide has you covered.

1. S5 Coupler Locks Demco 2-5/16″ Adjustable Coupler Lock (LCS002 Demco) – Custom Fit for Dump and Equipment Trailers with C-Channel Mounts. (Includes Trimax Puck Lock)

The S5 Coupler Lock keeps your trailer safe. It’s made for Demco 2-5/16” couplers with C-channel mounts. This custom fit ensures maximum security.

It’s heavy-duty and built to last. Made in the USA, it’s a trusted choice for trailer protection.

Pros	Cons
Custom fit for Demco 2-5/16″ couplers, ensures tight security. Heavy-duty build resists harsh weather and daily use. Made in the USA, guarantees top-quality craftsmanship. Trusted brand delivers reliable theft prevention.	Limited Compatibility: Only fits Demco 2-5/16″ couplers with C-channel mounts. Higher Price: Premium cost compared to basic trailer locks. Bulkier Design: Larger size may be less convenient for storage.

Perfect For:

This S5 Coupler Lock is perfect for anyone who owns a dump or equipment trailer with a Demco 2-5/16” adjustable coupler. It’s ideal for those who want maximum security and a custom fit to protect their trailer from theft.

Ready to Purchase?

View Price on Amazon (paid link)

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2. TowWorks 79852 Keyed Alike 5/8″ Trailer Hitch Lock Set for Adjustable Channel Mounts, Double Safety Heavy Duty Tow Hitch Receiver Locking Pins fit Class III – V Hitches

The TowWorks 79852 Hitch Lock Set keeps your trailer secure. It fits Class III – V hitches and adjustable channel mounts. The 5/8″ locking pin works with most hitches.

It includes 2 locks and 4 keys, all keyed alike. The push lock design makes it easy to use. A spring clip adds extra safety for peace of mind.

Rubber O rings stop rattling and keep the pin steady. The watertight dust cap protects against rust. This set is heavy-duty and built to last.

Pros	Cons
Fits most adjustable hitches for versatile use. Double safety with spring clip and lock mechanism. No rattling thanks to rubber O rings. Easy to use with push lock design and 4 keys.	Not compatible with FASTWAY adjustable hitches. Requires careful O-ring adjustment for different hitch sizes. Spring clip must be used for safety, adding an extra step.

Perfect For:

This TowWorks 79852 Keyed Alike Trailer Hitch Lock Set is perfect for anyone towing trailers with adjustable channel mounts. It’s ideal for Class III to V hitches, offering double safety and a heavy-duty design to keep your setup secure and rattle-free.

Ready to Purchase?

View Price on Amazon (paid link)

3. MaxxHaul Trailer Tongue Coupler Lock – Adjustable Trailer Tongue Pin, 1/4″ Diameter, Fits 1″ to 3″ Latch-Type Coupler for RV, Truck Towing

The MaxxHaul Trailer Tongue Coupler Lock is a must-have for secure towing. It’s built tough to handle any weather.

High-strength steel resists rust and corrosion. The chrome finish adds extra protection. It fits 1″ to 3″ couplers easily.

Push-to-lock design makes it simple to use. Adjustable lengths ensure a perfect fit. Two keys provide maximum security.

Pros	Cons
High-strength steel resists rust and corrosion in all weather. Adjustable lengths fit 1″ to 3″ couplers for versatile use. Push-to-lock design offers quick, keyless security. 360º rotating head ensures easy locking every time.	No anti-theft alarm for added security. Limited key copies available for replacement. Bulkier design may obstruct tight spaces.

Perfect For:

The MaxxHaul Trailer Tongue Coupler Lock is perfect for anyone who tows trailers, boats, trucks, or RVs. It’s easy to use and keeps your trailer secure in all weather.

Ready to Purchase?

View Price on Amazon (paid link)

4. Tevlaphee Wheel Lock Set,Trailer Security Adjustable Anti Theft Trailer Wheel Lock for Car Camper Trailers SUV Boat Motorcycle Great Deterrent 2 Packs 6 Alike Keys

Tevlaphee Wheel Lock Set,Trailer Security Adjustable Anti Theft Trailer Wheel Lock for Car Camper Trailers SUV Boat Motorcycle Great Deterrent 2 Packs 6 Alike Keys

Keep your vehicle safe with the Tevlaphee Wheel Lock Set. Made from strong steel, these locks are tough and durable. They come with 6 keys for easy access.

The bright colors make them highly visible, acting as a strong deterrent to thieves. They fit most vehicles, from cars to boats, with adjustable sizes. Installation is quick and simple.

Each set includes 2 locks and 3 keys. Tevlaphee offers great customer service, ensuring your satisfaction.

Pros	Cons
Strong steel and custom copper lock for top-notch security. Bright colors make it highly visible day and night. Fits most vehicles, from cars to boats and RVs. Quick install and easy removal with 6 alike keys.	No anti-drill protection for added security. Bulkier design may be hard to store in small spaces. Keys could get lost, leaving you locked out.

Perfect For:

This Tevlaphee Wheel Lock Set is perfect for anyone who wants to protect their vehicle. It’s great for car, camper, SUV, boat, or motorcycle owners looking for strong and easy-to-use security.

Ready to Purchase?

View Price on Amazon (paid link)

5. Master Lock Trailer Lock, Stainless Steel Adjustable Coupler Latch Lock, 2847DAT

Master Lock Trailer Lock is a sturdy and reliable security solution. It’s made in China and designed to last.

This stainless steel lock is highly durable and easy to use. It keeps your trailer safe and secure.

Installation is quick and simple. Handling is smooth and hassle-free. Protect your trailer with this trusted lock.

Pros	Cons
Durable stainless steel for long-lasting protection. Easy installation saves time and effort. Adjustable design fits most trailer couplers. Simple handling ensures hassle-free use.	Made in China, may raise quality concerns for some buyers. No advanced security features, basic protection only. Adjustable design might loosen over time with heavy use.

Perfect For:

This Master Lock Trailer Lock is perfect for anyone who needs a strong and reliable way to secure their trailer. It’s easy to install and use, making it great for busy people who value safety and convenience.

Ready to Purchase?

View Price on Amazon (paid link)

6. Reese Towpower 7042100 Adjustable Coupler Latch Lock , Black

The Reese Towpower 7042100 Adjustable Coupler Latch Lock is built to last. It has a nickel-plated steel shank and a brushed aluminum body.

This hitch lock fits most trailer couplers. It adjusts from 5/8-inches to 3-inches.

Easy to install. Keys included. Protects your trailer.

Pros	Cons
Durable nickel-plated steel and aluminum resist corrosion. Adjustable fit for most trailer couplers, 5/8″ to 3″. Visible silver color deters theft effectively. Easy installation with included keys for quick security.	Limited to specific trailer coupler sizes, may not fit all. No anti-pick features, basic lock mechanism. Visible design might attract unwanted attention.

Perfect For:

This Reese Towpower Adjustable Coupler Latch Lock is perfect for anyone who owns a trailer and wants to keep it safe. It’s easy to use and fits most trailers, making it a must-have for peace of mind.

Ready to Purchase?

View Price on Amazon (paid link)

7. METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock for Towing Trailer Security Fits 1-7/8″,2”, 2-5/16″ Coupler Yellow

METOWARE Trailer Coupler Lock Universal Adjustable Heavy-Duty Steel Trailer Hitch Lock, Anti Theft Trailer Ball Lock Towing Lock for Towing Trailer Security Fits 1-7/8

The METOWARE Trailer Coupler Lock is a heavy-duty solution for trailer security. Its all-metal design ensures strength and durability. The bright yellow color acts as a visible theft deterrent.

This lock fits 1-7/8″, 2″, and 2-5/16″ couplers, making it universally compatible. It has 11 adjustable locking positions for a perfect fit. Installation and removal are quick and easy.

The zinc alloy core and anti-corrosion coating provide all-weather protection. Rubber caps shield the lock from rain, snow, and dirt, ensuring long-lasting security.

Pros	Cons
Heavy-duty steel ensures maximum trailer security. Universal fit for all common coupler sizes. Quick, easy installation with 11 locking positions. Weatherproof design protects against rain, snow, and dirt. Bright yellow color deters theft effectively.	Bright yellow color may not suit all trailer aesthetics. No included keys for replacement if lost. Bulkier design might limit storage options.

Perfect For:

This trailer coupler lock is perfect for anyone who owns a trailer. It’s easy to use and works with most coupler sizes, keeping your trailer safe and secure.

Ready to Purchase?

View Price on Amazon (paid link)

8. REESE Towpower 72783 Coupler Lock, Adjustable Storage Security, Heavy-Duty Steel, Yellow and Chrome ( Universal Fit)

The REESE Towpower 72783 Coupler Lock keeps your trailer safe and secure. Made from heavy-duty steel, it resists rust and bad weather.

It fits all trailers with its adjustable design. Easy to install, remove, and use with 2 keys.

The bright yellow color deters thieves and stands out. Enjoy peace of mind with a quality warranty included.

Pros	Cons
Heavy-duty steel resists picking, prying, and drill outs. Bright yellow color deters theft and stands out clearly. Universal fit adjusts to 11 locking positions for easy use. Weather-resistant design ensures long-lasting protection.	No anti-cut features for added security. Keys can get lost, no backup option. Yellow color may fade over time.

Perfect For:

This REESE Towpower Coupler Lock is perfect for anyone who owns a trailer or truck. It’s easy to use and keeps your vehicle safe from theft.

Ready to Purchase?

View Price on Amazon (paid link)

9. RETRUE Universal Coupler Lock Trailer Locks Ball Hitch Trailer Hitch Lock Adjustable Security Heavy-Duty Steel Fits 1-7/8 Inch, 2 Inch, 2-5/16 Inch Couplers, Bright Yellow, Light Weight

RETRUE Universal Coupler Lock Trailer Locks Ball Hitch Trailer Hitch Lock Adjustable Security Heavy-Duty Steel Fits 1-7/8 Inch, 2 Inch, 2-5/16 Inch Couplers, Bright Yellow, Light Weight

The RETRUE Universal Coupler Lock keeps your trailer safe. It fits most couplers and comes with 2 keys. Its bright yellow color makes it easy to see.

This lock is strong and durable, made with high-quality materials. It’s rustproof and weatherproof, so it lasts a long time.

Pros	Cons
Fits all couplers, 1-7/8″ to 2-5/16″, with 11 locking positions. Bright yellow, lightweight, and flat for easy visibility and use. Heavy-duty steel and aluminum for maximum security and weather resistance. Enhanced lock cylinder with thicker keys for unbreakable protection.	Bright yellow color may not suit all trailer aesthetics. Lightweight design might raise durability concerns for heavy-duty use. No anti-pick feature in the lock cylinder for added security.

Perfect For:

This RETRUE Universal Coupler Lock is perfect for anyone who owns a trailer. It’s easy to use and fits most couplers, keeping your trailer safe and secure.

Ready to Purchase?

View Price on Amazon (paid link)

10. S5 Coupler Locks Heavy-Duty 2-5/16″ RAM Adjustable Coupler Lock (LCS002 RAM) – Custom Fit for C-Channel Mounted Equipment & Dump Trailers, Made in USA, (Includes Trimax Puck Lock)

Secure your trailer with the S5 Coupler Lock. This heavy-duty lock is a custom fit for Ram adjustable couplers. It’s a simple, all-in-one solution.

Made from strong steel, it’s built to last. The Trimax Puck Lock adds extra protection. Easy to install, it’s ready to use.

Proudly made in the USA, this lock meets high standards. It’s a reliable choice for trailer security. Keep your equipment safe.

Pros	Cons
All-in-one security for your coupler and bolts. Bolt cutter-proof steel for maximum protection. Quick install with included Trimax Puck Lock. USA-made quality for trusted durability.	Pricey compared to basic locks, might deter budget-conscious buyers. Bulkier design may not suit all trailer setups or storage needs. Requires specific coupler type, limiting universal compatibility.

Perfect For:

The S5 Coupler Lock is perfect for owners of dump trailers and C-channel mounted equipment. It’s easy to install and keeps your trailer secure.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Securing your trailer is easy with the right adjustable trailer lock. We’ve tested the best options to help you choose.

Factors to Consider When Buying:
– Material: Look for heavy-duty steel or stainless steel for maximum strength and durability.
– Weather Resistance: Choose locks with weatherproof designs to protect against rust and corrosion.
– Compatibility: Ensure the lock fits your coupler size and trailer type for a secure fit.
– Ease of Use: Opt for locks with push-to-lock or keyed alike systems for convenience.
– Visibility: Bright colors like yellow act as a theft deterrent and make the lock easy to spot.
– Adjustability: Locks with adjustable lengths or locking positions offer a custom fit for various trailers.
– Security Features: Look for anti-theft designs, rubber O-rings, and watertight dust caps for added protection.
– Installation: Choose locks that are easy to install and come with clear instructions.
– Warranty: A quality warranty ensures peace of mind and long-term reliability.

With these factors in mind, you’ll find the perfect adjustable trailer lock to keep your trailer safe and secure.