10 Best Trailer Hitch Locks Under $100 for Secure Towing in 2026

A trailer hitch lock is a small investment that can help prevent unauthorized hitching, coupling, or removal of your trailer. The right choice depends on whether you need to secure a receiver, a trailer coupler, or both.

We compared 10 trailer hitch locks under $100 across fit, construction, adjustability, locking style, and everyday usability so you can choose dependable protection without overspending.

Best 10 Trailer Hitch Locks Under 100 Picks for 2026

Best Universal Coupler Lock – Master Lock Red Trailer Lock

If you need one of the more versatile trailer hitch locks under 100, this Master Lock model fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers. Its bright red finish, keyed design, and resistance to picking and prying make it a practical choice for trailers stored at home, at a jobsite, or near a boat launch.

Best For: Owners who want a universal coupler lock with a highly visible finish.

Pros:

• Fits three common trailer coupler sizes.
• Bright red finish can discourage tampering.
• Locking mechanism resists picking and prying.
• Resists rust and corrosion and is rekeyable.

Cons:

• Uses a keyed lock rather than a keyless design.
• Supplied notes do not specify included spare keys.

This is a straightforward, flexible pick when your trailers use different coupler sizes. Its universal fit and limited lifetime warranty add useful value for regular trailer owners.

Best Standard Receiver Pin – Rhino USA 2-Inch Hitch Pin

Among trailer hitch locks under 100, the Rhino USA 2-inch hitch pin is designed for standard Class III and IV, 2-by-2-inch receivers. It uses a solid carbon-steel construction, powder-coated finish, and weatherproof slide cap to help protect the pin from tampering and outdoor debris.

Best For: Class III and IV receiver owners who need a locking hitch pin for trailers, RVs, or other towing equipment.

Pros:

• Fits standard 2-by-2-inch Class III and IV hitches.
• Solid steel construction provides a durable security point.
• Weatherproof cover helps block dirt, mud, and debris.
• Includes two keys and lifetime replacement support.

Cons:

• Designed for receiver-pin security, not coupler locking.
• Fit is limited to compatible 2-inch receiver setups.

This is a focused choice for securing a removable hitch or trailer connection on a standard receiver. Verify your receiver size before buying, since its stated fit is specifically for 2-by-2-inch Class III and IV hitches.

Best Value Coupler Security – Master Lock Black Trailer Lock

This Master Lock is a practical option for shoppers comparing trailer hitch locks under 100. The zinc trailer tongue lock fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers, blocking unauthorized coupling while providing resistance to picking, prying, rust, and corrosion.

Best For: Trailer, RV, camper, boat-trailer, and utility-trailer owners seeking broad coupler compatibility.

Pros:

• Fits several common coupler sizes.
• Blocks unauthorized coupling on parked trailers.
• Includes two keys for convenient use.
• Zinc construction resists rust and corrosion.

Cons:

• Keyed operation requires keeping track of the keys.
• Its black finish is less visually prominent than a bright finish.

With its wide fit range and included keys, this model suits households or fleets with varied towing equipment. It is especially useful for protecting trailers while they are parked or stored between trips.

Best Two-Lock Kit – Rhino USA Trailer Coupler Lock Kit

For shoppers seeking trailer hitch locks under 100 with broader coverage, this Rhino USA kit combines a coupler lock and latch lock operated by the same key. It fits specified 2-inch A-frame, 50×50, and 50×60 couplers and uses a powder-coated alloy-steel construction for outdoor trailer storage.

Best For: Owners of compatible 2-inch couplers who want keyed-alike protection for both the coupler and latch.

Pros:

• Combines two locks in one keyed-alike kit.
• Fits 2-inch A-frame, 50×50, and 50×60 couplers within stated limits.
• Powder-coated finish helps resist rust, corrosion, and harsh weather.
• Includes two matching keys and unlimited lifetime replacement support.

Cons:

• Compatibility is narrower than universal coupler locks.
• Requires checking the listed lip width and height limits before purchase.

This kit provides more complete coverage than a single coupler lock when your trailer matches its dimensions. Confirm the coupler profile and maximum lip measurements first to avoid a fit mismatch.

Best Everyday Receiver Security – METOWARE 2-Inch Hitch Lock

For shoppers comparing trailer hitch locks under 100, this METOWARE receiver lock offers a straightforward fit for many 2-inch hitch receivers. Its 5/8-inch steel pin, weather protection, and anti-rattle O-rings make it a practical choice for everyday towing setups.

Best For: Owners of standard 2-inch receivers who want basic theft deterrence and reduced hitch noise.

Pros:

• High-strength steel pin helps deter theft.
• Fits virtually any 2-inch x 2-inch receiver, subject to the double-wall limitation.
• Weather-resistant cover helps protect the keyhole from water and dust.
• Four rubber O-rings help reduce rattling during towing.

Cons:

• Not compatible with double-walled receiver tubes.
• Designed for 2-inch receivers rather than multiple receiver sizes.

This is a sensible, feature-focused option when your receiver matches the stated dimensions. Confirm compatibility before ordering, especially if your receiver uses a double-walled tube.

Best Adjustable Coupler Fit – METOWARE Universal Coupler Lock

Among trailer hitch locks under 100, this METOWARE model stands out for its adjustable coupler coverage. The ratchet design provides 11 locking positions and fits common 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.

Best For: Trailer owners who need one adjustable lock for multiple common coupler sizes.

Pros:

• Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
• Eleven ratchet positions allow adjustable installation.
• Aluminum and heavy-duty iron construction is corrosion- and rust-resistant.
• Rubber cap helps protect the lock from dust and water.

Cons:

• Its 30-day warranty is relatively limited.
• Designed for couplers, not receiver hitch pin locking.

The broad coupler compatibility and ratcheting adjustment make this a flexible pick for households with more than one trailer. Check your coupler size and locking position requirements before purchase.

Best Extended-Pin Coverage – JUSTTOP Class III/IV Hitch Lock

For buyers seeking trailer hitch locks under 100 with added receiver reach, the JUSTTOP lock uses a 3-1/2-inch effective pin length. Its 5/8-inch diameter fits most Class III and IV 2-inch and 2-1/2-inch receivers, while rubber O-rings help limit towing rattle.

Best For: Class III and IV receiver owners who need a longer locking pin for 2-inch or 2-1/2-inch setups.

Pros:

• 3-1/2-inch effective pin length supports broader receiver coverage.
• Fits most Class III and IV 2-inch and 2-1/2-inch receivers.
• Black electrophoretic-painted carbon steel resists bending.
• Four rubber O-rings help absorb vibration and reduce rattling.

Cons:

• Compatibility is described as fitting most receivers, so dimensions should be verified.
• The longer pin may be unnecessary for compact receiver setups.

This model is a good match when a standard-length pin may not provide enough reach. Verify your receiver class, size, and clearance before ordering.

Corrosion-Resistant Pick – Master Lock Adjustable Coupler Lock

Master Lock Adjustable Coupler Lock Stainless Steel Trailer Hitch 2847DAT | Keyed trailer hitch helps secure RVs, trailers & towing gear, fits coupler latch widths up to 2-3/4 inch, 6 locking positions

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If you are comparing trailer hitch locks under 100, the Master Lock 2847DAT is a practical option for trailers, RVs, and towing gear. Its adjustable design accommodates coupler latch widths up to 2-3/4 inches and offers six locking positions.

Best For: Owners who want an adjustable coupler lock with stainless steel components and keyway protection.

Pros:

• Fits coupler latch widths up to 2-3/4 inches.
• Stainless steel components help resist corrosion.
• Weather touch seal helps protect the keyway and shaft from dirt and moisture.
• Includes two keys and an ergonomically designed shaft end for easier installation.

Cons:

• Designed for coupler latches rather than a universal ball-coupler range.
• Only one lock is included.

With its slim-fit profile, six locking positions, and weather-focused features, this Master Lock is a sensible choice when adjustable fit and corrosion resistance matter.

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Compact Budget Choice – RETRUE Trailer Tongue Coupler Lock

RETRUE Trailer Tongue Hitch Coupler Lock, 1/4in Dia, 3/4in Span, Black | Heavy-Duty Security, Cut-Resistant, Weather Resistant, Anti-Theft Latch Lock, Tow Boat RV Truck Car's Coupler

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Among trailer hitch locks under 100, this RETRUE tongue coupler lock offers a compact padlock-style design for latch-type couplers. Its 1/4-inch pin fits couplers with a maximum span of 3/4 inch, so checking measurements before purchase is important.

Best For: Latch-type couplers that match the lock’s 1/4-inch diameter pin and 3/4-inch maximum span.

Pros:

• High-strength steel construction is intended to help deter theft.
• Zinc-plated pin and black finish provide protection against the elements.
• Simple quarter-turn activation supports convenient locking and unlocking.
• Includes two keys.

Cons:

• Limited to latch-type couplers with a maximum 3/4-inch span.
• Its compact fit is less suitable for couplers outside the specified dimensions.

This is a straightforward, weather-resistant option for a compatible trailer tongue, but its narrow size range makes accurate coupler measurement essential.

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Multi-Size Heavy-Duty Option – COOHAME Adjustable Trailer Lock

Trailer Hitch Locks with Keys, Universal Size Fit 1-7/8,2-5/16,2 Inch Ball Hitch Coupler Lock, Adjustable Heavy Duty Steel Trailer Tongue Lock for Boat, Trailers and RV, Anti-Theft Hitches, Red-1 Pack

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For shoppers comparing trailer hitch locks under 100, the COOHAME adjustable trailer coupler lock stands out for its broad fit range and highly visible red finish. It is designed for 1-7/8-inch, 2-inch, and 2-5/16-inch ball hitch couplers used with boats, campers, RVs, and other trailers.

Best For: Owners who need one adjustable lock for multiple common ball-coupler sizes.

Pros:

• Adjustable design fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
• Heavy-duty steel and aluminum construction is designed to resist prying, rust, and corrosion.
• Red finish makes the anti-theft device highly visible.
• Key-operated design uses one turn to open and is described as easy to install.

Cons:

• At 1.52 pounds, it is heavier than the compact coupler-lock options listed here.
• The supplied notes do not specify the number of keys included.

The adjustable fit makes this a flexible choice for households with different trailers, while its bright finish adds visible deterrence and makes the lock easy to spot.

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How We Picked the Best Trailer Hitch Locks Under 100

We focused on the features that matter most for practical trailer security: compatible receiver or coupler dimensions, steel construction, resistance to casual tampering, key or locking-pin design, weather exposure, and ease of installation. The selection includes receiver hitch pins, trailer tongue and coupler locks, and combination kits for different towing setups.

Because compatibility is critical, check your receiver size, coupler style, ball size, and available clearance before ordering. A strong lock that does not fit correctly cannot protect the trailer effectively.

Quick Comparison

Lock type	Best for	What to check
Receiver hitch pin lock	Securing a ball mount or accessory in a receiver	Pin diameter, usable length, and receiver class
Coupler lock	Preventing unauthorized trailer coupling	Coupler shape, latch clearance, and ball size
Adjustable coupler lock	Owners with multiple trailers or coupler sizes	Adjustment range and locking-bar engagement
Coupler lock kit	Added coverage for more than one connection point	Included components and individual fit

Key Buying Factors for Trailer Hitch Locks Under 100

Fit and Compatibility

Receiver locks commonly use a 5/8-inch pin for 2-inch receivers, but pin length and clearance vary. Coupler locks may support 1-7/8-inch, 2-inch, or 2-5/16-inch trailer balls. Confirm the stated dimensions rather than relying only on “universal” labeling.

Construction and Weather Resistance

Look for hardened or heavy-duty steel where possible, along with a protected or corrosion-resistant finish. If the trailer stays outdoors, a covered keyway and occasional lubricant can help maintain smooth operation.

Locking Design and Convenience

Choose keyed access when you want a familiar anti-theft system, and consider keyed-alike kits if several locks will be used together. A lock should be quick to install but leave minimal exposed space for prying or cutting.

Security Coverage

A receiver pin protects the hitch connection but does not necessarily stop someone from coupling the trailer. A coupler lock addresses that risk. For unattended trailers, using both types can provide more complete protection.

Who Should Buy Which Trailer Hitch Locks Under 100?

Choose a receiver hitch pin lock if your main concern is keeping a ball mount, drawbar, or hitch accessory secured in the vehicle’s receiver. Choose a coupler lock if the trailer will be parked unattended and you want to prevent it from being connected to a tow vehicle.

An adjustable coupler lock is the most flexible option for owners who use different trailer couplers or ball sizes. A kit makes sense when you want layered security at the receiver and trailer tongue. For occasional towing, a straightforward keyed lock may offer the best balance of price and convenience; frequent or long-term outdoor users should prioritize robust steel construction, corrosion resistance, and easy maintenance.