I'm not sure if the wiring situation would work in the RV you are getting. I have a 60" 4K (all the bells and whistles) in my living room that is used mainly for Amazon Prime, Netflix and Apple TV. Since I rarely watch cable (satellite) in the living room I didn't want to waste money on another receiver. But, sometimes I wanted the cable stuff to show up on that TV.
I got an HDMI splitter from Fry's Electronics. I connected a short HDMI cable from the receiver to the splitter. Then, I connected HDMI cables to the kitchen TV (the receiver is in the kitchen/breakfast room) and another through a wall connection that terminates in the living room. Works great but all tuning has to be done from the kitchen.
Here's the Fry's link for the 4-HDMI output box: FRYS.com¬*|¬*BYTECC