Safety Sentry: 5415 Contrary Creek Rd. Granbury, TX 76048 - A premier supplier of Mandated Hitch Locks—provides trailer lock safety for all types of towing hitches used for towing trailers on state and local highways. Insure your family and cargo’s protection through buying a locking device that prevents accidental separation of a towed and towing vehicle. Safeguard your trailer against accidents utilizing the Safety Sentry Hitch Lock. Hitch Lock, Trailer Lock Safety, Trailer Hitch Lock, Trailer Lock, Safety Trailer hitch lock, State mandated Trailer Hitch laws, Horse Trailers, Camping trailers, Used trailers, RV Trailers, Cargo Trailers.