I'm getting ready to do one in my UA. I've got a 20" tube tv which I'll be replacing in the compartment that has the outside entertainment radio. The compartment also has the electrical connections and the TV connections. The only problem is that the connections are for regular TV and not High Definition satellite or cable. We can use the regular TV connection for over the air HD, though, which limits your options. Haven't figured out yet how to get HD connections in that compartment.
I'm going to use an articulating wall mount, bolted into the front wall of the compartment. This way the TV can be pulled out of the compartment and angled different ways to allow better viewing.
Shouldn't be too hard....I'm past the point where I cry when drilling holes in the coach.
Here's a link to a sample wall mount that I'm talking about using. Should work well for a 20" LCD.
http://www.mountsandmore.com/Premier...M2-PM1246.html