My 1997 Liberty has a TV above the drivers seat and one in the bedroom. The bedroom TV gets it's source from a switcher in the overhead above the drivers seat. The problem is that everything uses the type of cabling that is used for cable TV, which limits what I can hook to it when updating my bus.
Belkin's RemoteTV looks like a good solution. It includes a transmitter that has inputs for audio and video (you can choose between component, S-video, etc.) that you can hook to your primary audio/video source and a receiver that you can hook to a second TV that is up to 350 feet away. It also can send the commands from your IR remote control so you can control your video equipment from the remote TV location.
You can find more about it at the following web site:
http://www.pureav.com/remotetv/
I haven't ordered it yet, but might do so very soon... let me know if you have found a better solution.