William's post started me thinking about doing the same thing, but the mount he specified was designed for very large TVs and couldn't handle the small VESA bolt pattern used by my TV. But I was determined not to give up and eventually found a mount that I liked even more than his. It is a little more expensive but take a look at how it handles a 39" TV:
The first picture is the TV in the "watching" position. Notice that the top edge of the TV is significantly below the upper cabinets and the TV is nearly at the mid-line of the coach.
The second shot shows the TV in the stowed (travel) position. Notice that the bottom of the TV is level with the bottom of the old TV cabinet. I removed the ugly fabric "surround" that went around the face of the cabinet which was designed for the old tube-type TV.
The last picture shows the mount from the rear so you can see this elegant (and very substantial) piece. Notice how the outer arm is positioned down; it has an adjustable counterbalance spring that can handle TVs up to 25 lbs which covers almost everything less than 60" being sold today.
The arm has a full 20" of vertical motion possible (10" up/10" down)
Here's a link if anyone is interested in buying one:
http://www.ergodirect.com/product_info.php?products_id=17438 Both my DW and I agree that having the TV this low makes all the difference in the world with respect to comfort. Having to look up to watch TV (even though it isn't much) puts a strain on your neck; this is a much more normal viewing position. I do still need to fashion a panel to cover up the junk I have inside the old TV cabinet which includes the subwoofer for my sound system.