Trailer Cable the last section of your trailer wiring harness  to improve safety, reduce harness road damage and improve the reliability of your connection! With all plug options available and four easy mounting methods, KM Trailer cable is the "Original" coiled cable that connects any vehicle and trailer combination securely, significantly improving safety and durability. A proprietary all-weather, water and abrasive resistant hybrid polymer coiled outer jacket prevents wear and tear and increases the life your trailer wiring harness.