Jeepin » Wiring your XJ for trailer towing Wiring your XJ for trailer towing . Posted December 09, 1999 the harness back to the sheetmetal and stuff all the wiring back in the side of the Jeep. Now run the 4-way trailer plug out to the trailer hitch, replace the trim panel, test the trailer plug to make sure it’s working properly, and you’re done. Jeep Cherokee Trailer Wiring | etrailer Trailer Wiring Harness Make installing your trailer wiring harness as easy as possible with a custom fit wiring harness. Trailer wiring from Draw-Tite, Curt, Pollak, Tow Ready, Bosal, and Hopkins eliminates or reduces the need to cut and splice wires. It also helps to protect your vehicle's sensitive electronics from mis-wired trailers.