I am in the process of prewireing my doors for a future speaker upgrade. I am doing it now because I am currently installing FatMat sound deadener. The front door was fairly easy. The rear door not so much. When I pulled the rubber boot that carries the wires from the cab to the door I found a weather tight connection at the B pillar. So there isn't a way to run new wire to the into the door. So my question is to those that have run new wire to the doors. How did you do it?