In my previous bus, the TV up front had been replaced with a flat screen. Whoever did the switch simply built a plywood mount (basically an L bracket), that the TV mounted to directly with screws through the back.

The bottom piece of plywood, was beveled at the end, so it would slip under another piece which held it from tipping forward (if you can imagine this. otherwise I'll try to draw a picture).

The whole thing was held in place by a couple of screws, holding the base of the plywood mount in place in the cabinet. When I needed to get inside I had to remove the outside bezel (wood, 4 screws), and unscrew a couple of screws in the TV base, and pull it out straight forward.

Whole thing couldn't have cost more than $5 to make, and worked great.

Ray