You can't just hang a TV and the mount anywhere, the wall has to be re-inforced to accept the mount, called a 'tv backer' in RV language.
Of course if you are willing to beef up the wall with some plywood that is bolted to the wall then you might be able to hang a bigger, heavier TV.
Keep in mind the supplied Sansui TV in my r-pod is about the lightest TV I have ever lifted...I'm quite sure that a bigger TV is gonna weigh more....maybe a lot more, and that will put a strain on the walls, especially as the r-pod hits bumps and potholes.
A flat TV that is NOT installed, but rather sitting on legs on the table or floor, could be about any size you want to deal with...taking into account being able to store it for travel, and work around it when camped.
My opinion, (and I'm biased, I dont watch TV) is that there is nothing on broadcast television worth that much trouble and expense. In fact, I removed the TV from my r-pod in the first week of ownership. That's how I know how lightweight it is!