The HOC-LOC™ Trailer Door Lock is a rugged, reliable automatic door lock, providing worry free safety, security, and Quality Assurance. The HOC-LOC™ Trailer Door Lock can be purchased as a stand-alone unit or can be packaged with the optional Brake Lock and or GPS Tracking & Control Unit. In combination with the GPS Tacking & Control Unit, operation, programming, and event reporting is possible from remote locations with password access from a desktop computer. Home | Trailer Systems | Truck Systems | Trailer Door Lock | Chassis System | Container System | Equipment Systems About Us | Benefits | News | Links | Contact Us PATENT PENDING It is the policy of the J.P. Holt Corporation to vigorously defend its intellectual property rights