Shop Nilight 7 Way Trailer Plug Extension Cord 12 Feet Heavy Duty 7 Pin Wiring Harness Cable 10-14 AWG Double-Prong Copper Terminals Wires for 7-Blade RV Tow Wiring Connector-12FT in high quality, support 2 Years Warranty. Simply plug this extension cable into your existing 7-way trailer plug and instantly extend its reach by 12 feet. It’s a convenient solution for all your trailer extension needs.