A reliable trailer hitch lock helps prevent unauthorized coupling, hitch-pin removal, and trailer theft when your equipment is parked or attached to a tow vehicle.
We compared 10 trailer hitch locks under $300 across receiver compatibility, coupler fit, materials, adjustability, weather resistance, and everyday ease of use so you can choose the right style for your trailer.
Table of Contents
- Best 10 Trailer Hitch Locks Under 300 Picks for 2026
- Universal Coupler Pick – Master Lock Red Trailer Lock
- Weatherproof Receiver Choice – Rhino USA 2-Inch Hitch Pin
- Classic Tongue Security – Master Lock Black Coupler Lock
- Multi-Size Receiver Set – MaxxHaul Hitch Pin Locks
- Heavy-Duty Coupler Pick – Universal Yellow Trailer Lock
- Corrosion-Resistant Choice – Master Lock 2847DAT
- Receiver Hitch Pick – 2-Inch Locking Hitch Pin
- Heavy-Duty Pick – Rhino USA Coupler Lock Kit
- Visibility Pick – RETRUE Adjustable Coupler Lock
- Universal Red Deterrent – COOHAME Adjustable Trailer Hitch Lock
- How We Picked the Best Trailer Hitch Locks Under 300
- Quick Comparison
- Key Buying Factors for Trailer Hitch Locks Under 300
- Who Should Buy Which Trailer Hitch Locks Under 300?
Best 10 Trailer Hitch Locks Under 300 Picks for 2026
Universal Coupler Pick
- Fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers
- Resists picking, prying, rust, and corrosion
- Bright red, rekeyable keyed design
Best For: Multi-trailer owners needing broad coupler compatibility
Weatherproof Receiver Choice
- Fits Class III and IV 2-inch receivers
- Solid carbon-steel, tamper-resistant construction
- Weatherproof slide cap and lifetime replacement promise
Best For: Standard 2-inch receiver users
Classic Tongue Security
Master Lock Black Coupler Lock
- Fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers
- Zinc construction resists rust and corrosion
- Includes two keys and resists picking and prying
Best For: General-purpose parked trailer protection
Multi-Size Receiver Set
- Includes 1/2-inch and 5/8-inch solid-steel pins
- Fits Class I through V receivers
- Press-to-lock design with rubber keyhole cap
Best For: Multiple vehicles or varied receiver sizes
Heavy-Duty Coupler Pick
- Fits 1-7/8-inch, 2-inch, and 2-5/16-inch couplers
- 11-position adjustable ratchet design
- All-metal build with weather-protective caps
Best For: Multi-size coupler compatibility and high visibility
Corrosion-Resistant Choice
- Stainless steel components resist corrosion
- Fits latch widths up to 2-3/4 inches
- Six locking positions and two included keys
Best For: Compact RV and trailer coupler security
Receiver Hitch Pick
- 5/8-inch high-strength steel hitch pin
- Fits compatible 2-by-2-inch receivers
- Rubber O-rings help reduce rattling
Best For: Compatible 2-inch receiver hitch security
Heavy-Duty Pick
- Two-lock kit uses matching keys
- Powder-coated alloy-steel construction
- Fits specified 2-inch couplers
Best For: Compatible 2-inch trailer couplers and two-point security
Visibility Pick
RETRUE Adjustable Coupler Lock
- 11 adjustable locking positions
- Fits three common coupler sizes
- Bright yellow, weather-resistant design
Best For: Multi-trailer owners wanting a highly visible adjustable lock
Universal Red Deterrent
COOHAME Adjustable Trailer Hitch Lock
- Fits three common coupler sizes
- Steel and aluminum construction
- Red, highly visible anti-theft design
Best For: Boat, RV, camper, and general trailer owners
Universal Coupler Pick – Master Lock Red Trailer Lock
The Master Lock 379ATPY is a practical choice for shoppers comparing trailer hitch locks under 300. Its universal design fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers, while the bright red finish makes the lock easy to spot.
Best For: Boat, RV, camper, and utility trailers that use common coupler sizes.
Pros:
- Fits three common trailer coupler sizes.
- Locking mechanism resists picking and prying.
- Rust- and corrosion-resistant construction with simple installation and removal.
- Backed by a limited lifetime manufacturer warranty.
Cons:
- Uses a keyed locking system rather than keyless access.
- Its painted red finish may show wear over time.
This is a versatile coupler lock for owners who want one visible, easy-to-use solution across multiple trailers. Its rekeyable design and broad fit add useful flexibility for regular towing and storage.
Weatherproof Receiver Choice – Rhino USA 2-Inch Hitch Pin
The Rhino USA 2-inch trailer hitch pin is a focused option among trailer hitch locks under 300 for standard Class III and IV receivers. Its solid carbon-steel construction and weatherproof slide cap are designed for everyday towing conditions.
Best For: Trailers, RVs, and other towing setups using a standard 2-inch by 2-inch receiver.
Pros:
- Fits standard Class III and IV 2-inch receivers.
- Solid steel construction provides a durable, tamper-resistant design.
- Weatherproof cover helps block dirt, mud, and debris.
- Includes two keys and a lifetime replacement promise from Rhino USA.
Cons:
- Limited to 2-inch receiver openings.
- Does not provide the multi-size pin set offered by some alternatives.
Choose this lock if your vehicle already uses a 2-inch receiver and you value a protective cover for the key area. It is a straightforward, American-owned-brand option with a stated lifetime replacement policy.
Classic Tongue Security – Master Lock Black Coupler Lock
The black Master Lock 379ATPY is a versatile trailer tongue lock for buyers seeking trailer hitch locks under 300. It blocks unauthorized coupling and fits 1-7/8-inch, 2-inch, and most 2-5/16-inch couplers.
Best For: Parked RVs, campers, boat trailers, and utility trailers with common coupler sizes.
Pros:
- One lock fits several common coupler sizes.
- Keyed mechanism is designed to resist picking and prying.
- Zinc construction resists rust and corrosion for outdoor use.
- Includes two keys and weather-resistant features.
Cons:
- Keyed operation requires keeping track of the included keys.
- The listed warranty is one year.
This model is a sensible general-purpose choice when the main goal is preventing unauthorized coupling while a trailer is unattended. Its black finish is understated, and the broad coupler fit suits mixed towing equipment.
Multi-Size Receiver Set – MaxxHaul Hitch Pin Locks
The MaxxHaul 50058 stands out among trailer hitch locks under 300 by including both 1/2-inch and 5/8-inch receiver pins. That makes it useful for Class I through V towing setups with either 1-1/4-inch or 2-inch receiver openings.
Best For: Owners who use different receiver classes or want one lock set for multiple vehicles.
Pros:
- Includes both 1/2-inch and 5/8-inch solid-steel pins.
- Fits Class I, II, III, IV, and V receivers.
- Press-to-lock design locks instantly, with two keys included.
- Chrome-finished carbon steel and a rubber keyhole cap help with outdoor use.
Cons:
- Includes two pin sizes rather than a single dedicated pin.
- Backed by a 90-day manufacturer warranty.
This set is the most flexible pick here for households with different receiver sizes. The push-button locking design simplifies installation, while the included rubber cap helps keep dirt, ice, and moisture away from the keyhole.
Heavy-Duty Coupler Pick – Universal Yellow Trailer Lock
For shoppers comparing trailer hitch locks under 300, this METOWARE coupler lock offers broad fitment and a highly visible design. Its all-metal construction, 11 locking positions, and weather-protective rubber caps make it a practical choice for securing several common coupler sizes.
Best For: Owners who need one adjustable lock for 1-7/8-inch, 2-inch, and 2-5/16-inch couplers.
Pros:
- Fits three common coupler sizes with 11 adjustable locking positions.
- All-metal construction with corrosion-resistant zinc plating.
- Bright yellow finish provides strong visual theft deterrence.
- Rubber caps help protect the locking mechanism from rain, snow, dirt, and debris.
Cons:
- At 1.6 pounds, it is heavier than some compact coupler locks.
- Its bright color may not suit buyers seeking a discreet appearance.
The adjustable ratchet design is the main advantage here, especially for households or fleets using trailers with different couplers. It is a versatile, visible option when convenience and all-weather protection matter.
Corrosion-Resistant Choice – Master Lock 2847DAT
Among trailer hitch locks under 300, the Master Lock 2847DAT stands out for its stainless steel components and slim-fit design. It accommodates coupler latch widths up to 2-3/4 inches and provides six locking positions for a more tailored fit.
Best For: RV and trailer owners who want a compact, corrosion-resistant coupler lock with two keys.
Pros:
- Stainless steel components help resist corrosion.
- Fits coupler latch widths up to 2-3/4 inches.
- Six locking positions support adjustable fitment.
- Weather touch seal helps shield the keyway and shaft from dirt and moisture.
Cons:
- It has fewer locking positions than some more adjustable coupler locks.
- The supplied notes do not specify compatibility with multiple coupler sizes.
With its slim profile, sealed keyway, and stainless steel components, this Master Lock is geared toward straightforward everyday use. It is a sensible pick when corrosion resistance and a compact form are higher priorities than maximum adjustment.
Receiver Hitch Pick – 2-Inch Locking Hitch Pin
For buyers searching trailer hitch locks under 300, this METOWARE receiver lock is designed for standard 2-by-2-inch hitch receivers. Its 5/8-inch steel pin, watertight cover, and rubber O-rings provide security while helping reduce towing-related rattling.
Best For: Owners of compatible 2-inch receivers who want a locking hitch pin for a ball mount or trailer hitch accessory.
Pros:
- High-strength steel 5/8-inch pin helps deter theft.
- Fits most 2-by-2-inch receivers with 2-3/4 inches of effective pin length.
- Water- and dust-resistant cover protects the keyhole.
- Four rubber O-rings help reduce rattling noise during towing.
Cons:
- Not compatible with double-walled receiver tubes.
- Designed for 2-inch receivers rather than other receiver sizes.
This is the most specialized option in the group: it secures the receiver connection rather than a trailer coupler. Check the receiver construction before buying, but compatible 2-inch setups should benefit from the steel pin, sealed lock, and anti-rattle rings.
Heavy-Duty Pick – Rhino USA Coupler Lock Kit
For shoppers comparing trailer hitch locks under 300, the Rhino USA Coupler Lock Kit is a practical two-lock option for compatible 2-inch A-frame and select trailer couplers. Its powder-coated alloy-steel construction is designed to deter tampering while resisting weather exposure.
Best For: Owners of boat trailers, RVs, toy haulers, and campers with compatible 2-inch couplers who want one key for two locks.
Pros:
- Fits 2-inch A-frame, 50×50, and 50×60 couplers within the stated lip dimensions.
- Includes a coupler lock and latch lock operated by matching keys.
- Powder-coated finish helps shield against rust, corrosion, and harsh weather.
- Backed by an unlimited lifetime replacement warranty.
Cons:
- Compatibility is limited by the listed maximum lip width and height.
- At 1.91 pounds, it is heavier than some adjustable alternatives.
This kit stands out when the coupler matches its specified dimensions and you value a coordinated two-lock setup with lifetime replacement coverage.
Visibility Pick – RETRUE Adjustable Coupler Lock
Among trailer hitch locks under 300, this RETRUE adjustable lock emphasizes broad coupler compatibility and high visibility. Its bright yellow finish makes the anti-theft device easy to notice, while 11 locking positions help accommodate several common coupler sizes.
Best For: Trailer owners who need one adjustable lock for 1-7/8-inch, 2-inch, and 2-5/16-inch couplers and prefer a prominent deterrent color.
Pros:
- Adjusts across 11 locking positions for three common coupler sizes.
- Bright yellow color provides highly visible protection.
- Combines an aluminum body with high-strength A36 steel construction.
- Includes two keys and is described as rustproof and weatherproof.
Cons:
- The 120-day warranty is shorter than some lifetime-backed options.
- Its universal adjustment may require careful positioning for a secure fit.
The RETRUE is a flexible choice for households with different trailer coupler sizes, especially where visibility and easy size adjustment matter more than extended warranty coverage.
Universal Red Deterrent – COOHAME Adjustable Trailer Hitch Lock
This COOHAME model is a useful contender among trailer hitch locks under 300 for owners who want adjustable coverage across common ball coupler sizes. The red finish adds visibility, while the steel-and-aluminum construction and keyed lock core are intended to resist tampering and weather-related wear.
Best For: Boat, RV, camper, and other trailer owners needing an adjustable lock for 1-7/8-inch, 2-inch, or 2-5/16-inch couplers.
Pros:
- Adjustable design fits the three listed common coupler sizes.
- Heavy-duty steel and aluminum materials are intended to resist cutting, prying, rust, and corrosion.
- Red finish creates a noticeable anti-theft deterrent.
- One-turn keyed opening and quick installation support convenient use.
Cons:
- Supplied notes do not specify a warranty period.
- Adjustment is required to match the individual coupler size.
Choose this lock if you want broad size compatibility, a conspicuous red finish, and a straightforward adjustable design for several trailer types.
How We Picked the Best Trailer Hitch Locks Under 300
We focused on the features that matter most in real towing and storage situations: compatibility with common 1-7/8-inch, 2-inch, and 2-5/16-inch couplers; 1/2-inch and 5/8-inch receiver-pin sizing; locking mechanism design; construction materials; adjustability; and resistance to casual tampering. We also included both coupler locks and receiver hitch-pin locks because they protect different connection points.
A coupler lock prevents someone from attaching a trailer to another vehicle, while a receiver pin lock helps secure the ball mount or accessory inside the receiver. Some buyers may need one type, while others will benefit from using both.
Quick Comparison
- Best for broad coupler compatibility: Adjustable and universal coupler locks that fit multiple ball sizes.
- Best for receiver security: Locking hitch pins sized for 2-inch receivers.
- Best for complete coverage: Coupler lock kits paired with a receiver pin or additional locking hardware.
- Best for visibility: Bright yellow or red finishes that make a lock easy to identify and check.
- Best for frequent towing: Stainless or corrosion-resistant designs with straightforward key access.
Key Buying Factors for Trailer Hitch Locks Under 300
Check the Exact Fit
Measure your trailer coupler opening and receiver before ordering. A lock designed for a 2-inch receiver is not automatically suitable for a 2-5/16-inch coupler. Adjustable models offer more flexibility, but their stated fit range still needs to match your hardware.
Choose the Right Lock Type
Coupler locks protect the trailer’s front connection point when it is parked. Hitch-pin locks secure a ball mount, drawbar, or other receiver-mounted accessory. If theft prevention is a priority, consider a two-lock setup rather than expecting one device to protect every connection.
Prioritize Construction and Weather Protection
Steel provides useful strength, while stainless steel and corrosion-resistant finishes can be better choices for trailers exposed to rain, road salt, or coastal air. Look for covered keyways or other protection if the lock will remain outdoors.
Consider Daily Handling
A lock that is difficult to align, unlock, or remove may be frustrating during frequent towing. Bright finishes improve visibility, and a simple adjustable mechanism can save time when switching between trailers.
Who Should Buy Which Trailer Hitch Locks Under 300?
Occasional trailer owners should look for an affordable universal or adjustable coupler lock that fits their ball size and is easy to store. Frequent towers may prefer a durable stainless or corrosion-resistant model with smooth key operation. Owners of multiple trailers can benefit from adjustable locks with broader compatibility, provided each coupler falls within the listed range. Anyone securing a trailer and ball mount together should consider combining a coupler lock with a locking receiver pin for more complete protection.
Before buying, verify the dimensions, read the manufacturer’s fit notes, and lubricate exposed locking components periodically. No compact hitch lock is theft-proof, but the correct fit and consistent use can significantly reduce opportunistic theft.