My intent is to have the TV in a cabinet on the pasenger side wall centered at about 3-4 feet behind the passenger's front seat. When it's going to be viewed it will cover part of the side windows, so I don't want it in a fixed position. I was going to redesign the area over the front windshields to support a 40" TV, but my wife fell in love with a dual recliner sofa that is now behind the Driver's seat. So, the best TV viewing would be directly in front of the sofa.

So, far everone I've found on the web is electric in in the $800+ price range. That seems extreme, but having not seen one in person I can't really judge how elaborate they are. An all spring one might work. I have to tell you I can't quite visualize how a spring one would work. I'll keep searching.