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

A reliable trailer lock can help deter opportunistic theft when your trailer is parked or hitched to your vehicle. The right choice depends on whether you need to secure the coupler, the receiver, or both.

We selected 10 trailer hitch locks under $100 across common trailer and receiver sizes, focusing on fit, adjustability, construction, locking design, and everyday towing convenience.

Best 10 Trailer Hitch Locks Under 100 Picks for 2026

Universal Red Coupler Security – Master Lock 379ATPY

For shoppers comparing trailer hitch locks under 100, the Master Lock 379ATPY is a versatile coupler lock for common 1-7/8-inch, 2-inch, and 2-5/16-inch trailer couplers. Its bright red painted finish adds visibility, while the keyed mechanism is designed to resist picking and prying.

Best For: Boat, RV, camper, and utility trailers that need a universal coupler lock.

Pros:

• Fits three common trailer coupler sizes.
• Advanced locking mechanism resists picking and prying.
• Bright red finish may discourage tampering and is easy to spot.
• Designed to resist rust and corrosion; backed by a limited lifetime warranty.

Cons:

• Uses a keyed lock rather than a combination mechanism.
• The finish is painted, so it may show wear with frequent outdoor use.

This is a practical pick when one coupler lock needs to work across several trailer sizes. Its universal fit and visible finish make it especially useful for storage at a driveway, jobsite, or boat launch.

Weatherproof Receiver Protection – Rhino USA 2-Inch Hitch Pin

Among trailer hitch locks under 100, the Rhino USA 2-inch hitch pin is a focused receiver-pin option for standard 2-by-2-inch Class III and IV hitches. Its solid carbon-steel construction, powder-coated finish, and weatherproof slide cap are suited to regular towing use.

Best For: Class III and IV receivers on trailers, RVs, and other 2-inch towing setups.

Pros:

• Fits standard 2-inch-by-2-inch Class III and IV hitches.
• Solid steel construction provides a tamper-resistant design.
• Weatherproof cover helps block dirt, mud, and debris.
• Includes two keys and a lifetime replacement guarantee.

Cons:

• Not presented as a universal coupler lock for 1-7/8-inch or 2-5/16-inch couplers.
• Its 2-inch receiver fit may not suit 2-1/2-inch hitch setups.

The Rhino USA is a straightforward choice for owners with a compatible 2-inch receiver. The covered locking area and lifetime replacement support add convenience for outdoor towing and storage.

Black Universal Coupler Lock – Master Lock 379ATPY

For trailer hitch locks under 100 that prioritize broad coupler compatibility, this black Master Lock trailer tongue lock fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers. The zinc construction is designed to resist rust and corrosion, and the package includes two keys.

Best For: Parked RVs, campers, boat trailers, and utility trailers using common coupler sizes.

Pros:

• Works with three common coupler sizes, including most 2-5/16-inch couplers.
• Locking mechanism is designed to resist picking and prying.
• Zinc construction offers rust and corrosion resistance.
• Includes two keys for convenient use or backup.

Cons:

• Keyed operation requires keeping track of the supplied keys.
• Its one-year manufacturer warranty is shorter than some competing coverage.

This model is a sensible all-around coupler lock for owners who use different trailers or want one lock for several common coupler sizes. Its black finish is understated, while the weather-resistant construction supports outdoor storage.

Anti-Rattle Receiver Pin – JUSTTOP 5/8-Inch Hitch Lock

If you are comparing trailer hitch locks under 100 for a 2-inch or 2-1/2-inch receiver, the JUSTTOP locking pin combines receiver security with noise control. Its 5/8-inch carbon-steel pin has a 3-1/2-inch effective length, and four rubber O-rings are intended to reduce hitch rattling during towing.

Best For: Class III and IV 2-inch or 2-1/2-inch receivers where reducing rattling is also important.

Pros:

• Designed for most Class III and IV 2-inch and 2-1/2-inch receivers.
• Black electrophoretic-painted carbon steel resists bending.
• Tubular key system and zinc-alloy cylinder add tamper resistance.
• Four rubber O-rings help absorb vibration and reduce rattling.

Cons:

• Receiver compatibility should be checked against the 3-1/2-inch effective pin length.
• Its anti-rattle design adds components that may require more setup than a basic pin.

The JUSTTOP stands out for buyers who want more than a locking connection. The included O-rings address hitch movement and noise, while the steel pin and tubular key system provide the product’s stated theft-deterrent features.

Best Universal Fit – Adjustable Trailer Coupler Lock

For shoppers comparing trailer hitch locks under 100, the METOWARE Heavy-Duty Universal Trailer Coupler Lock stands out for its broad coupler compatibility and adjustable ratchet design. It fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers, with 11 locking positions for a closer fit.

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

Pros:

• Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
• Ratchet design offers 11 locking positions and quick installation.
• Aluminum and heavy-duty iron construction is corrosion- and rust-resistant.
• All-weather rubber cap helps protect the lock from dust and water.

Cons:

• Only a 30-day warranty is listed.
• Designed for couplers rather than 2-inch receiver tubes.

Its universal fit and adjustable design make this a flexible choice when trailer coupler dimensions vary. The zinc-alloy tubular lock core and included two keys add practical security features without complicating installation.

Best for 2-Inch Receivers – 5/8-Inch Hitch Receiver Lock

Among trailer hitch locks under 100, this METOWARE receiver lock is a focused option for standard 2-inch by 2-inch hitch receivers. Its 5/8-inch steel pin has 2-3/4 inches of effective length, while rubber O-rings help reduce rattling during towing.

Best For: Drivers with a compatible 2-inch receiver who want a weather-protected locking hitch pin.

Pros:

• High-strength steel construction is intended to deter theft.
• Fits many 2-inch by 2-inch receivers with its 5/8-inch pin.
• Water- and dust-resistant cap protects the keyhole.
• Four rubber O-rings help reduce rattling and towing noise.

Cons:

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

Check your receiver construction before ordering, especially if it has double walls. For a compatible 2-inch receiver, the combination of steel construction, a covered lock core, and anti-rattle O-rings makes this a practical everyday choice.

Best Two-Lock Kit – Rhino USA Coupler Lock Set

For buyers seeking trailer hitch locks under 100, the Rhino USA Trailer Coupler Lock Kit combines a coupler lock and latch lock in one keyed-alike set. It is sized for 2-inch A-frame, 50×50, and 50×60 couplers, with a powder-coated alloy-steel finish for added weather resistance.

Best For: Owners of compatible 2-inch couplers who want matching coupler and latch locks operated by one key.

Pros:

• Fits specified 2-inch A-frame, 50×50, and 50×60 couplers.
• Two-lock kit uses one key for both locks.
• Powder-coated alloy steel helps resist rust and corrosion.
• Includes a lifetime replacement warranty and two matching keys.

Cons:

• Compatibility is more size-specific than a universal adjustable lock.
• Heavier than some single-lock options at 1.91 pounds.

This kit is particularly convenient if you want to secure both the coupler and latch without carrying separate keys. Confirm the coupler lip limits—3-3/4 inches maximum width and 5/16-inch maximum height—before purchasing.

Most Visible Universal Pick – METOWARE Adjustable Coupler Lock

For shoppers comparing trailer hitch locks under 100, this METOWARE coupler lock stands out for its bright yellow finish, all-metal construction, and broad fit. Its 11-position ratchet adjusts for 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.

Best For: Trailer owners who want highly visible, adjustable protection across common coupler sizes.

Pros:

• Fits three common coupler sizes with 11 locking positions.
• Bright yellow finish provides a noticeable theft deterrent.
• Rubber caps and zinc plating help protect against weather and corrosion.
• All-metal construction with a zinc-alloy tubular lock core.

Cons:

• At 1.6 pounds, it is heavier than the Master Lock option listed here.
• The bright finish may not suit buyers seeking a discreet appearance.

The adjustable design makes this a versatile choice for households with multiple trailers or coupler sizes. Its weather protection and high-visibility color add practical advantages for outdoor storage.

Best Compact Stainless Option – Master Lock 2847DAT Coupler Lock

Among trailer hitch locks under 100, the Master Lock 2847DAT is a compact option with stainless steel components and a slim fit. It accommodates coupler latch widths up to 2-3/4 inches and provides six locking positions for adjustment.

Best For: Buyers who prioritize a lightweight, corrosion-resistant coupler lock with a compact profile.

Pros:

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

Cons:

• Has six locking positions, fewer than the 11-position METOWARE model.
• The supplied notes do not specify compatibility with particular ball-coupler sizes.

Its four-ounce weight and slim-fit design make it convenient for regular use, while the stainless components and weather seal support outdoor applications. It is a practical pick when compactness matters most.

Best Heavy-Duty Red Lock – COOHAME Universal Trailer Lock

For shoppers seeking trailer hitch locks under 100, this COOHAME model combines a bold red finish with heavy-duty steel and aluminum construction. Its adjustable design fits 1-7/8-inch, 2-inch, and 2-5/16-inch ball-hitch couplers.

Best For: Boat, RV, camper, and trailer owners wanting a conspicuous adjustable tongue lock.

Pros:

• Fits three common ball-hitch coupler sizes.
• Heavy-duty steel and aluminum construction is designed to resist prying.
• Red finish makes the anti-theft device easy to notice.
• Key-operated design installs quickly and uses a full key turn to open.

Cons:

• At 1.52 pounds, it is not as lightweight as the four-ounce Master Lock.
• The supplied notes do not state how many adjustment positions are available.

This lock is a strong fit for buyers who want broad compatibility and a prominent visual deterrent. Its corrosion-resistant materials and quick-install design also suit trailers exposed to outdoor conditions.

How We Picked the Best Trailer Hitch Locks Under 100

We compared these locks by the job they perform, their stated size compatibility, construction, ease of use, and the type of security they provide. The selection includes coupler locks for securing an unattended trailer, receiver hitch pins for locking a ball mount in place, and combination kits for broader coverage.

Fit was a major consideration. A lock that does not match the coupler profile, receiver diameter, or pin length may be difficult to install or leave unnecessary movement. We also favored designs with adjustable positions or broad compatibility when that versatility did not compromise straightforward operation.

Quick Comparison

Lock type	Best for	What to check
Coupler lock	Preventing trailer hookup when parked	Coupler size and latch shape
Receiver hitch pin lock	Securing a ball mount or accessory	Receiver size, pin diameter, and usable length
Coupler lock kit	Protecting both trailer and hitch connection	Included components and matching sizes

Key Buying Factors for Trailer Hitch Locks Under 100

Lock Type and Coverage

A coupler lock blocks access to the trailer’s hitch mechanism, making it the usual choice for storage or parking. A receiver pin lock secures the drawbar or ball mount to the vehicle but does not prevent someone from coupling an unattended trailer. If you need layered protection, consider a kit or use both lock types.

Size and Compatibility

Confirm whether your coupler accepts 1-7/8-inch, 2-inch, or 2-5/16-inch ball sizes. For receiver locks, verify whether your vehicle uses a 2-inch or 2-1/2-inch receiver and check the required 5/8-inch pin diameter. Universal and adjustable models are convenient, but the locking bar still needs to sit firmly across the latch or receiver.

Construction and Weather Exposure

Look for steel components, corrosion-resistant finishes, and a sealed or shielded locking mechanism if the trailer is stored outdoors. No lock is theft-proof, so prioritize substantial construction and keep the keyway clean and lubricated according to the manufacturer’s instructions.

Daily Use

Choose a design that installs quickly and gives you room to operate it around the coupler or receiver. A protected shackle can make tampering more difficult, while a compact body may be easier to carry. Check whether spare keys are included and whether the lock can remain installed during normal towing.

Who Should Buy Which Trailer Hitch Locks Under 100?

Choose an adjustable coupler lock if you own multiple trailers or want broad compatibility across common ball sizes. A receiver hitch pin lock is the practical pick for securing a removable ball mount, bike rack, or other hitch accessory to your vehicle. If you leave a trailer unattended regularly, prioritize a heavy-duty coupler lock, and consider pairing it with a receiver lock for additional protection. For occasional towing, a straightforward keyed model with the correct fit may provide the best balance of cost and convenience.