Check these guys out. I have used their stuff for lap tops, GPS's, depth finders and fishing rods. They have something for about anything you want to mount. You could attach a Vesa plate/ball to the screen and move it to multiple locations that you run antenna to if you wanted.
I need to stay up front with mine since I use the AUX on the radio to feed the TV/DVD sound to. It's not surround, but with the powered sub woofer, it sounds better that the TV speakers. I may end up storing the screen for the ride and attaching it with something from their extensive catalog at the camp site. I can see a pipe base mounted to the dog house that would raise the screen above the dash (or suspend downward from the cabinets over the dash?) with a swing arm for side to side movement terminating with the vesa/ball to the screen...
RAM Mounting Systems, Inc.