On the road for 6 months? You need 3 rows of seats. That means you are in a TT. And you'll be taking along 3000 pounds of stuff with you. So I'd say you are limited to full sized passenger vans, 3/4+ ton. I highly recommend the late model GM twins with 6.0L/6-spd trans. Find a bunkhouse or toy hauler with a large cargo carrying capacity under 7k dry.
Mounting flip down TVs cannot be done on just any wall inside an RV. The walls are not designed to hold much weight, so they need a backer/brace inside the wall. Curtains can be added easily enough. Is 4 TVs necessary? I recommend tablets and headphones instead as long as you will have internet access.