I haven't thought much about TVs for now. Since you and I have a few years before we RV, and since technology keeps changing, I think I'll select the TV after I buy the RV.
There is a new technology called 4K, for TVs, that gives 4 times the resolution of current HD TV sets. In 5 years, those TVs will be cheap. I could see replacing whatever TV is in the used RV that I buy with one of those babies in 5 years.