2007 Silverado 2500 HD. Slide in camper plug in. Right now I am running an extension from the 7pin at rear into the bed to the camper. I would like to have a 7 pin at front of the bed. I was told there is a cable preinstalled, have tow package etc, but can't seem to find it. Right about where I would expect it I see a thick bundle of wires, assuming that is all the wiring for back of truck including the 7pin. So far I see no other bundle. Does anyone know if there is and where it would be? This is all routed over the top of the gas tank.