If you get a quality TV with wide viewing angle, you should not have to swivel it to the large couch to get a good picture. I went with the Samsung 5200 series LCD smart TV's for the picture quality and feature set. The same remote will control either TV and the menus are identical in operation. The stock mount adjusts slightly for up/down angle but no left/right.
I have the integrated radio/DVD offered by Host. Although I could have have found a more high end model with additional features, I did not want to have to do the required wire runs and external antenna install. Host does offer a number of prewire options that are not listed - Mine was basically outfitted and ready for the TV's of my choosing. The Outside TV has its own DVD player built in to the unit, so it is not connected to the RV radio. The exterior housing has runs for a DC jack, AC outlet and antenna feed. The bedroom is fed by the RV radio through composite video and RCA audio while the living room is fed by HDMI from the same radio. I would look at the double DIN sized automotive models verses anything offered for the RV industry if I was installing my own head unit. If you want to reduce wire clutter, there are 32" televisions with DVD players built in - I installed a 22" version like this in my Arctic Fox verses going with their offerings.
I have a single gang two-plug outlet mounted to the underside of the control panel cabinet above the TV area. I'm not sure if this is an option only included with their inverter. Just above my RV radio is a 12VDC power port and two USB charge ports - If you have these, you may be able to tap power for a 12VDC television.