2018 Ford F-350 Super Duty Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2018 Ford F-350 Super Duty. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your Ford F-350 Super Duty and the fastest shipping available. Ford F-250 and F-350 Super Duty Trailer Wiring | etrailer Trailer Wiring Harness Installation - 2005 Ford F-350. Today, on our 2005 Ford F350 Super Duty Crew Cab, we're going to be installing the Bargman 5th-wheel and gooseneck 90-degree wiring harness with a 7 pole and a 9 foot long lead. Part number 50-97-410.