I don't know what kink of rig you've got but I've done this before. The valance has to be removed-- that is a fairly easy job. There are usually a few screws holding each one on . Use a #2 square bit screwdriver to remove the screws.
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.