Whatever electrical system you choose, youUll need a cord to connect electricity between the towed vehicle and the motorhome. ROADMASTERUs are the best Q the wires are water-, oil- and chemical-resistant, and the plugs are injected with silicone to prevent corrosion. Flexo-Coil cords expand to over eight feet, and conveniently contract for storage; use a straight cord kit for ROADMASTER All Terrain tow bars. Straight cord wiring kits for tow bars with cable channel guides 7 wire to 6 wire straight cord kit.