On my Monaco, there was ONE spot on the roof that was designed for all wires to come down through. That spot was over a wall cavity and led to a junction box at the bottom in the back of a cabinet. Monaco uses some covers to hide wires in the back of cabinets but removing a few of these allowed the fishing of the cables where ever they are needed. In the kitchen area, I had to remove some cabinet drawers to fish the wires to the entertainment center, or other locations. Check and see if you have a certain location on top of your coach that was designed for cable routing.
