On my National Dolphin, there was a wooden frame around the TV that was just a decorative fascia. The TV was actually mounted to a heavy metal platform, and it took me forever to figure out how to get the tv off of it even though all the screws were loose. Turns out there were metal tabs welded to the base that poked up into recesses in the bottom of the TV. I had to lift the TV up and over them to get it out, which was not easy as the TV was around 100 lbs.
2004 National Dolphin LX 6320, W-22, 8.1, Allison 1000, Front/rear Trac Bars, Hellwig Rear Anti-sway Bar, Sumo Springs, Roadmaster Reflex Steering Stabilizer, 2005 PT Cruiser Toad