Hi Doug,
I have been considering upgrading the old 32" flat panel the front of our coach to a larger 42 to 50" unit as well but am investigating alternatives to mounting it from the ceiling as I do not like looking up at the TV. There are a variety of electric lift systems now on the market that are designed to hide the flat screens in cabinetry until required, at which point they rise up from within, or behind. You may have an appropriate space available to accommodate this at a much more natural viewing angle. I plan to research this option for our coach and have a possible suitable space behind the "computer desk" in our Patriot Thunder. It will block the lower portion of that window when raised but will disappear when lowered. The space above the drivers seat can then be reclaimed for DVD/CD/Book storage. Just an alternative suggestion that maybe you hadn't thought of? This would avoid the structural issues and will eliminate the bandages required to patch our scalps when "head meets TV".
I replaced the old 20" CRT bedroom screen with a 32" flat screen by attaching the new LED TV to a frame with a piano hinge assembly that fits over the original opening for the old TV. The new TV covers the opening nicely and can be swung open to access the space behind as required and it looks pretty much factory when closed.
Dwight Wilson