Different make/model RV's are wired differently for cable and satellite, not surprisingly. My motorhome for example, only had a single cable TV input from the outside, since it's wired through a Winegard power injector/switch for the rooftop OTA antenna, can not be used for satellite without making some modifications. It's also RG-59 not RG-6, so it's not recommended for multi-LNBF use. I added a separate RG-6 input that's a nearly direct run from the outside jack to our Hopper w/Sling with no splitters or injectors in the line. I only have a cable/OTA jack in the bedroom, so I can't say with any certainty what your setup is. When we had a Joey in the coach with our Hopper w/Sling, I ran the single coax (yes, it's RG-6) from the Solo Node at the dish to the coach input, and at the inside end, through a Dish Tap to the Hopper. The third port on the Tap had the RG-59 coax going to the bedroom connected to it with the Joey at the other end. Now we use a FireTVstick and the DishAnywhere app for the bedroom TV.
For your Dish account, just use you PO box for your billing address, and your current location as your service address so you'll get the correct locals if you have that option. If/when you move to a different location, if it's outside of the current locals spot beam, just chat or call Dish with the new service address to update the locals. Just make sure they only change the service address, not you billing address.