Karl,
I was a long time DirecTV customer. I signed up when it was brand new and I was mad at my cable company. It was easy to use both at home and in the motorhome. Gradually it became complex. The addition of local channels, more channels, DVRs and HD required more satellites and more complex receiving systems. Politics got involved too. The FCC was pressured by sports franchises, advertisers and stations to write rules that help us watch what they think we are supposed to watch. For example, if I was in Seattle during a blacked out Seahawks game, DirecTV had to be sure I couldn't watch it.
As the systems and FCC rules evolved, the "Terms of Service" agreements grew in detail and length. What you could, should or be allowed to do changed. At one point, a DirecTV representative told me I had to divide my account in two. One would be for the condo and one would be for the motorhome. And, yes, I would pay double.
About a year ago, the receiver in the motorhome died from being 9 years old. I was in Arizona. My "service address" on file was our condo near Seattle. The DirecTV representative refused to ship a receiver to Arizona. He was only allowed to provide service to the "service address".
Realizing that my TV watching has declined, I that I had reliably sent $15,000 to DirecTV over the years and (from my point of view) the service level had gone to hell, I quit. (Karl, you can tell I'm still mad at them!)
As near as I can tell, Dish has some more RV friendly "terms of service" now. What ever you do, read the fine print and make sure you know how you can tune the shows you want, especially the major networks. Also be sure that the terms of service specially allow you to install systems in both the house and RV.