Bart,
Like Steve said, it is common to run solar panel wiring down the refrigerator vent, but since most of the HR models that you have locate the refrigerator in a slide, that probably will not work for you. Also running down to the engine air intake would just get you into the air intake and you would have to drill through it in the engine compartment to run to a controller and then to your battery bay. I would find a closet near the battery bay, drill through the roof above it being careful to avoid any wiring, run the wire down to a controller in the closet, seal the roof with the type of wiring cover used in satellite dish installations, and then drill through the floor to run the wiring to the battery bay. This would give you the shortest wire run (important for solar panel installations) and cleanest looking system.
Gerald
