A reliable trailer lock is a simple way to make your towing setup harder to steal when your vehicle is parked. The right choice depends on whether you need to secure the trailer coupler, the receiver hitch, or both.
We compared 10 trailer hitch locks under $100 across compatibility, adjustability, construction, installation, and everyday convenience to help you choose a practical match for your trailer and vehicle.
Best 10 Trailer Hitch Locks Under 100 Picks for 2026
Bright Universal Protection
- Fits three common coupler sizes
- Visible red finish and pry-resistant mechanism
- Rust- and corrosion-resistant with limited lifetime warranty
Best For: Owners securing multiple trailer types
Heavy-Duty Receiver Security
- Fits Class III and IV 2-inch receivers
- Solid carbon steel, tamper-resistant design
- Weatherproof cover, two keys, and lifetime replacement
Best For: Standard 2-inch receiver owners
Proven Trailer Coverage
- Fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers
- Blocks unauthorized coupling
- Zinc body, two keys, and outdoor-resistant features
Best For: RV, boat, camper, and utility trailer owners
Adjustable High-Visibility Security
- 11 locking positions for three coupler sizes
- Bright yellow, rustproof, and weatherproof design
- Aluminum body, A36 steel construction, and two keys
Best For: Owners wanting adjustable, visible coupler protection
Best Receiver Fit
- 5/8-inch high-strength steel locking pin
- Weather-protected keyhole with two keys
- Four O-rings help reduce rattling
Best For: Compatible 2-inch receiver hitches
Best Two-Lock Kit
Rhino USA Trailer Coupler Lock Kit
- Secures both coupler and latch
- Keyed alike with two matching keys
- Powder-coated alloy steel with lifetime replacement
Best For: Compatible 2-inch trailer couplers
Best Universal Coupler Fit
METOWARE Adjustable Coupler Lock
- Fits three common coupler sizes
- Eleven-position adjustable ratchet
- Visible yellow, weather-protected design
Best For: Owners of 1-7/8-inch to 2-5/16-inch couplers
Best Anti-Rattle Pick
JUSTTOP Hitch Receiver Pin Lock
- 5/8-inch pin for Class III and IV receivers
- Four rubber O-rings help reduce rattling
- Includes two keys and tubular key cylinder
Best For: Compatible 2-inch and 2-1/2-inch receivers
Best Heavy-Duty Pick
METOWARE Adjustable Trailer Coupler Lock
- Fits three common coupler sizes
- Eleven-position ratcheting adjustment
- Includes two keys and rubber weather cap
Best For: Owners needing an adjustable lock for multiple trailer couplers
Best Slim Stainless Option
Master Lock 2847DAT Coupler Lock
- Stainless steel components resist corrosion
- Fits latch widths up to 2-3/4 inches
- Six locking positions with weather seal
Best For: Compact protection for trailer and RV coupler latches
Bright Universal Protection – Master Lock Red Coupler Lock
For shoppers comparing trailer hitch locks under 100, this Master Lock coupler lock is a versatile choice for common trailer sizes. Its bright red finish adds visibility, while the keyed mechanism is designed to resist picking and prying.
Best For: Owners of boat, RV, camper, and utility trailers who want one lock for multiple coupler sizes.
Pros:
- Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
- Bright red finish can discourage tampering and makes the lock easy to spot.
- Advanced locking mechanism resists picking and prying.
- Resists rust and corrosion, with simple installation and removal.
Cons:
- The red painted finish may show wear over time with outdoor use.
- It is a keyed lock, so keys must be kept available.
This is a practical universal option when you use different trailers or want a highly visible coupler lock. Its limited lifetime warranty is an added benefit for long-term ownership.
Heavy-Duty Receiver Security – Rhino USA 2-Inch Hitch Pin
Among trailer hitch locks under 100, the Rhino USA hitch pin is a focused option for standard 2-inch receivers. Its solid carbon steel construction and weatherproof slide cap are designed to provide durable, tamper-resistant security.
Best For: Class III and IV hitch owners using 2-inch-by-2-inch receivers on trailers, RVs, and other towing equipment.
Pros:
- Fits standard Class III and IV 2-inch receivers.
- Solid carbon steel construction is built for hitch security.
- Weatherproof cover helps block dirt, mud, and debris.
- Includes two keys and a lifetime replacement promise.
Cons:
- It is limited to standard 2-inch receiver hitches.
- This receiver pin is not described as a universal coupler lock for 1-7/8-inch or 2-5/16-inch couplers.
Choose this model when your setup uses a 2-inch receiver and you prefer a receiver pin with a protective dust cover. Its fit is narrower than a universal coupler lock, but the design is purpose-built for standard receiver security.
Proven Trailer Coverage – Master Lock Black Tongue Lock
This Master Lock trailer tongue lock is a dependable contender among trailer hitch locks under 100, especially for owners who want broad coupler compatibility. It blocks unauthorized coupling and uses a keyed mechanism designed to resist picking and prying.
Best For: Parked RVs, campers, boat trailers, and utility trailers using common coupler sizes.
Pros:
- Fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers.
- Helps deter theft by blocking unauthorized coupling.
- Zinc construction resists rust and corrosion for outdoor use.
- Includes two keys and offers weather- and cut-resistant features.
Cons:
- The fit is specified as “most” 2-5/16-inch couplers, so compatibility should be checked.
- Only one lock is included, with no spare unit for another trailer.
Its black finish is understated, and the universal sizing makes it suitable for varied towing equipment. Verify your coupler dimensions before ordering, particularly if you use a 2-5/16-inch setup.
Adjustable High-Visibility Security – RETRUE Yellow Coupler Lock
For buyers seeking trailer hitch locks under 100 with adjustable coverage, the RETRUE coupler lock offers 11 locking positions. Its yellow finish is easy to see, while the aluminum body and A36 steel construction are designed for cut and shear resistance.
Best For: Trailer owners who want an adjustable lock for 1-7/8-inch, 2-inch, or 2-5/16-inch couplers.
Pros:
- Adjusts through 11 locking positions for a broad fit.
- Fits three common coupler sizes.
- Bright yellow color provides highly visible deterrence.
- Includes two keys and a rustproof, weatherproof design.
Cons:
- The bright yellow finish may not suit buyers seeking a low-profile appearance.
- The 120-day warranty is shorter than a lifetime warranty.
- Its adjustable design requires selecting the correct locking position for your coupler.
This is a strong fit for shoppers who prioritize adjustability and visibility over a discreet appearance. The upgraded lock cylinder and thicker keys add useful security features, while the 120-day quality warranty provides limited coverage.
Best Receiver Fit – METOWARE 2-Inch Hitch Lock
If you’re comparing trailer hitch locks under 100, the METOWARE Trailer Hitch Lock is a straightforward receiver-pin option for standard 2-inch hitches. Its 5/8-inch steel pin, weather-protected keyhole, and included O-rings focus on basic theft deterrence and reduced towing noise.
Best For: Owners of compatible 2-inch receiver hitches who want a weather-protected locking pin with anti-rattle features.
Pros:
- High-strength steel construction helps deter theft.
- Fits most 2-inch x 2-inch receivers with a 5/8-inch pin.
- Weather cover helps keep water and dust away from the keyhole.
- Four rubber O-rings can help reduce rattling during towing.
Cons:
- Not compatible with double-walled receiver tubes.
- Designed for 2-inch receivers rather than a range of receiver sizes.
Check your receiver construction and pin-hole fit before ordering. For a compatible 2-inch setup, this lock combines practical security, weather protection, and noise reduction without adding unnecessary complexity.
Best Two-Lock Kit – Rhino USA Trailer Coupler Lock Kit
Among trailer hitch locks under 100, the Rhino USA Trailer Coupler Lock Kit stands out for covering both the coupler and latch. It is made for specified 2-inch trailer couplers and uses matching keys, making it a practical choice for securing a boat trailer, RV, toy hauler, or camper.
Best For: Owners of compatible 2-inch A-frame or listed couplers who want a keyed-alike coupler and latch lock kit.
Pros:
- Two-lock kit secures the coupler and latch.
- Fits 2-inch A-frame, 50×50, and 50×60 couplers within stated dimensions.
- Powder-coated alloy steel finish helps resist rust and corrosion.
- Two matching keys operate both locks, and lifetime replacement is included.
Cons:
- Compatibility is limited by the specified lip width and height measurements.
- At 1.91 pounds, the kit is heavier than a single coupler lock.
Measure the coupler’s lip dimensions before buying, since the listed fit is specific. If it matches, the keyed-alike design and two-lock coverage offer more comprehensive trailer security than a single lock.
Best Universal Coupler Fit – METOWARE Adjustable Coupler Lock
For shoppers seeking trailer hitch locks under 100 with broad coupler compatibility, the METOWARE Trailer Coupler Lock fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers. Its adjustable ratchet provides 11 locking positions, while the bright yellow finish makes the lock easy to notice on a stored or hitched trailer.
Best For: Trailer owners using one of the three listed coupler sizes who want an adjustable, highly visible lock.
Pros:
- Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
- Eleven ratchet positions allow adjustable installation.
- All-metal construction and zinc plating support durability.
- Rubber caps help protect the locking mechanism from weather and debris.
Cons:
- It is designed for couplers, not receiver hitch-pin locking.
- Its 1.6-pound construction may be less convenient than a lighter lock.
Confirm your coupler size before purchase, then use the adjustable ratchet to achieve a secure fit. The yellow finish and three-size compatibility make this a practical choice when visibility and flexibility matter.
Best Anti-Rattle Pick – JUSTTOP Hitch Receiver Pin Lock
For shoppers comparing trailer hitch locks under 100, the JUSTTOP receiver pin lock is a practical choice for Class III and IV 2-inch or 2-1/2-inch receivers. Its 5/8-inch pin, tubular key cylinder, and included rubber O-rings address both security and towing noise.
Best For: Owners of compatible 2-inch or 2-1/2-inch receivers who want a locking hitch pin with built-in rattle reduction.
Pros:
- 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.
- Includes two keys and a tamper-resistant tubular key system.
Cons:
- Designed for receiver-pin security rather than coupler locking.
- Compatibility should be confirmed because the effective pin length is 3-1/2 inches.
The JUSTTOP stands out when reducing hitch movement and noise matters alongside basic theft deterrence. Verify your receiver size and clearance before buying.
Best Heavy-Duty Pick – METOWARE Adjustable Trailer Coupler Lock
Among trailer hitch locks under 100, the METOWARE adjustable coupler lock is useful for households with trailers using different coupler sizes. Its ratcheting design provides 11 locking positions and fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
Best For: Trailer owners who need one adjustable lock for common coupler sizes and want a weather-protective rubber cap.
Pros:
- Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
- Eleven ratchet positions allow adjustable installation.
- Aluminum body and iron construction offer corrosion and rust resistance.
- Includes two keys and an all-weather rubber cap for the keyway.
Cons:
- Its 30-day manufacturer warranty is relatively limited.
- This is a coupler lock, not a receiver hitch pin lock.
The METOWARE is a flexible pick for trailers with common coupler dimensions. Its broad fit range and adjustable ratchet make sizing simpler, while the rubber cap helps shield the lock from dust and water.
Best Slim Stainless Option – Master Lock 2847DAT Coupler Lock
For buyers browsing trailer hitch locks under 100, the Master Lock 2847DAT offers a slim adjustable coupler design with stainless steel components for corrosion resistance. It fits coupler latch widths up to 2-3/4 inches and provides six locking positions.
Best For: Trailer, RV, and towing-gear owners seeking a compact adjustable coupler lock with weather protection for the keyway.
Pros:
- Stainless steel components provide corrosion resistance.
- Fits coupler latch widths up to 2-3/4 inches.
- Six locking positions support adjustable fitting.
- Weather touch seal helps protect the keyway and shaft from dirt and moisture.
Cons:
- It is intended for coupler latches, not receiver hitch pins.
- The listed fit is based on latch width, so measurement is important before purchase.
The 2847DAT is a straightforward choice for buyers who prioritize a slim profile and corrosion-resistant components. Measure the coupler latch and consider the six-position adjustment to confirm a suitable fit.
How We Picked the Best Trailer Hitch Locks Under 100
We focused on the main lock types used by trailer owners: coupler locks that prevent attachment to a tow ball, receiver hitch pin locks that secure the drawbar to the vehicle, and kits that address both points. We also considered fit range, pin diameter, adjustability, materials, locking mechanism, corrosion resistance, and how straightforward each lock is to install.
Because prices and availability can change, verify the current listing details before ordering. A low price is useful only when the lock fits your trailer or receiver correctly and is durable enough for the conditions where you tow or store it.
Quick Comparison
| Lock type | Best for | What to check |
|---|---|---|
| Coupler lock | Preventing unauthorized trailer hookup | Coupler style, width, and latch clearance |
| Receiver pin lock | Securing a ball mount or accessory | Receiver class, pin diameter, and usable length |
| Adjustable lock | Trailers with varied coupler profiles | Adjustment range and jaw engagement |
| Lock kit | Securing both trailer and receiver points | Included components and keyed-alike operation |
Key Buying Factors for Trailer Hitch Locks Under $100
Compatibility and Dimensions
Measure before buying. Coupler locks must fit the latch opening without interfering with the trailer tongue, while receiver pins need the correct diameter and enough usable length for the receiver and accessory holes. A lock advertised for a 2-inch receiver may not fit a 2-1/2-inch setup without the appropriate design.
Security Design
Look for hardened or heavy-duty steel components, a shrouded or protected locking cylinder, and minimal exposed room for cutting tools. No consumer lock is theft-proof, but a close-fitting design and sturdy construction can discourage opportunistic theft.
Weather Resistance and Maintenance
Outdoor exposure can cause corrosion and sticky key operation. Stainless or coated components are useful, but all locks benefit from occasional cleaning, lubrication made for lock cylinders, and removal when the trailer is being serviced.
Ease of Use
A lock that is difficult to reach or operate may be left unused. Favor designs with clear adjustment points, smooth locking action, included keys, and a shape that works with your trailer’s limited clearance.
Who Should Buy Which Trailer Hitch Locks Under 100?
- For basic trailer parking security: Choose a coupler lock matched to your trailer’s coupler size.
- For securing a removable ball mount or accessory: Choose a locking receiver pin with the correct diameter and receiver class.
- For multiple trailers or uncertain fit: An adjustable universal coupler lock offers more flexibility, provided its range covers your latch.
- For stronger overall coverage: Choose a kit or pair a coupler lock with a receiver pin lock so both the trailer and hitch connection are secured.
- For frequent towing: Prioritize quick operation, weather-resistant construction, and a design that can stay attached without rattling or obstructing the latch.
Before purchasing, confirm the product dimensions against your trailer and vehicle, then check that the lock can be fully closed and secured without forcing the mechanism.