A locking pin is a small, affordable way to add a bit of security to your trailer hitch. The HAUL-MASTER 5/8 inch Trailer Coupler Pin Lock from Harbor Freight has 4.6 stars out of five ...
There are several different types of trailer hitch locks available ... out dirt and grime. This coupler lock features a type A key, which is a spring-loaded, seven-pin high-security key.