Aupar Gooseneck Trailer Lock — Patent-Designed 2-Position Coupler Lock, Red, Corrosion-Resistant

Aupar's patent-designed gooseneck trailer lock is a heavy-duty coupler lock with two locking positions to fit most 7" bottom-plate trailers and deter theft.

Keep your trailer secure without guessing whether the coupler lines up with a single hole. This lock was engineered to offer two locking positions, a corrosion-resistant metal body, and a custom lock core for stronger anti-tamper protection. Finished in a high-visibility red, it fits a wide range of gooseneck couplers — square or round tubes up to 4.2 inches — and simplifies attachment and storage while reducing the chance of unauthorized unhooking.

How does the two-hole structure make locking simpler?

The dual-position design removes the need for precise alignment between the trailer coupler and the hitch plate. You can set the lock in one of two holes, letting it accommodate minor variations in height or fit and speeding up hookup and removal.

• Two locking positions to handle different trailer offsets
• Less time spent aligning coupler and bottom plate
• Reduces frustration when parking on uneven ground
• Simplifies use for multiple trailers with similar fittings

Will this lock stand up to weather and rough use?

The body is constructed from sturdy metal with corrosion-resistant treatment so it tolerates outdoor exposure and heavy use. That durability helps the lock remain functional after repeated installations and during long-term storage outdoors.

• Metal construction resists bending and impact
• Corrosion-resistant finish for wet and salty conditions
• Suitable for frequent on-road and off-road use
• Red finish improves visibility for storage and safety checks

How secure is the special lock core against theft?

The lock incorporates a bespoke core and mechanism designed to increase resistance to common tampering techniques. While no lock is absolute, the design raises the effort and time required to force an unauthorized release, acting as a strong deterrent.

• Custom lock core for added pick and tamper resistance
• Robust locking pin and housing reduce leverage attacks
• Visible deterrent to opportunistic theft
• Works in concert with hitch coupling to secure trailer attachment

Which trailers and couplers are compatible with this lock?

This model is aimed at most gooseneck trailers with a 7" bottom plate and fits square or round couplers whose tube diameter is under 4.2 inches. Before buying, it's best to double-check measurements to ensure a proper fit.

• Designed for 7" bottom-plate gooseneck couplers
• Accepts square and round coupler tubes up to 4.2" in diameter
• Two positions accommodate small height or offset differences
• Recommended: confirm dimensions with seller if uncertain

Who is this for? Haulers, fleet managers, and owners of gooseneck trailers who want an easy-to-use, weather-resistant coupler lock that offers flexible alignment and improved tamper resistance will find this product useful. It’s especially practical for anyone who switches trailers regularly or parks in shared, unsecured lots and wants a visible, reliable deterrent without complex installation. If you need absolute assurance about a fit, confirm your trailer’s bottom plate and tube diameter before ordering to ensure smooth, trouble-free use.