I removed a Sony Wega 26 inch from an /06 Class C made by Triple E in Canada. It was a beast, weighed about 85 pounds.
Took me quite a while to figure out how it came out, and in the end, it came out easily. In my case, the TV had a pin hole built into the back of the TV, and the frame in the rig had the pin facing downward. I had to lift the front of the TV, and this dropped the back of the TV, and the pin then came out of the hole.
I used the existing frame to build up something that I could mount a tilting extendable swing arm on, all perfectly set so the new TV would snugly fit into the space. I build a couple of tabs on each side that held the new wide screen in when driving. Big improvement.