I can't be of specific help because my coach is a 2007 TourMaster, but my bedroom TV was originally a 12 volt DC unit which I replaced with a wide screen HD capable one some years ago. I did have an AC outlet in the cabinet behind the TV location I could access, and the coax cable connection was there as well. I placed a Blu-ray media player in an adjacent cabinet and connected it via an HDMI cable so that is the best quality video on that screen, but the feed from the front equipment center over the windshield that has the rest of the electronics is via that one coax cable so everything else arriving at that bedroom TV is over that lower quality connection.
I wrote a thread about that installation some time ago -- maybe I can link to it here.
http://www.gsowners.com/viewtopic.php?f=1&t=2471
I have changed out both the front and the rear TVs that came with my coach at that time for more capable and contemporary ones -- may need to do it again now that UDH is getting more available...