I installed them on my coach, and just used small screws into the vinyl covered bottom of the entertainment center cabinets that are over the dash. Since the Holiday Rambler and the Windsor were built by Monaco, I'd guess that the bottom of the entertainment center has similar construction. Mine have held up for several years over some rough roads with no problem.
You can find 12 volts in the entertainment center that feeds the relay blocking TV operation when the ignition key is on. It's also fairly easy to run a new wiring inside the front windshield post on the driver's side after you've removed the trim from the post.
I used a push button remote originally to control the shades, but that died within the first year. After that, I installed two switches on the dash to control the shades.
Fred
