I have no experience with how much power a 12 volt TV would take up, but maybe that might be another possibility for you? I have been reading over http://www.12volt-travel.com/
to see what possibilities are out there and they have some flat screens (some with built in dvd players) that might work, depending on the size you're looking for...I think the biggest they sell are 22".
I looked at the 19" skyworth with dvd player and (assuming wattage is constant), it should use 5 amps to run and if you're running it for only a couple of hours, you should be fine. Nice part is that it also comes with the 120 plug so that if you are on shore power somewhere, you can plug in to 120 too.
60 watts/12 volts = 5 amps
Just another possibility....
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP