Trailer wiring for a 94 s15 4x4

Wondering if there is a easy way to wire this thing in??? Not finding any wires under bumper area at all. Wiring seems to go along quarter panels into the rear tailight area but not connected to each other via Bumper area or under side of chassis?? Do I have to home make these from both tailights to connect underneath for the wiring 4 pin plug? I did see they don't make a wiring kit for this year 4x4 that I know off, only 2 wheel drive 2 door I have a four door. Any help before I start wiring this thing would be great from someon e thats dealt with this before. Thanks, Dan :screwy: