I switched from DirecTV to Dish at the house a couple of years ago. I'd been a DirecTV customer from the very early days when you bought the equipment and did the install yourself. When I decided to upgrade to HD I called DirecTV and they sent an installer out who told me he "would not permit me to do my own install". I told him to hit the road and I called Dish but they kind of told me the same thing. I located an authorized Dish dealer on the Internet and bought the equipment from him and did my own install. But when I called Dish to have it turned on they told me it wasn't a valid receiver (it was brand new). So I called the Internet dealer, explained the problem and he set me up with a Pay As You Go monthly plan. Then he told me I could manage the account myself via the Internet, which I can. Have had it for a couple of years now without any problems.
So I suspect if you buy the equipment yourself from a dealer you can have them set up the account for you for the house. After that it's pretty simple to cancel the RV account and add the option to your home account.
Like they say at the VA now, it's all a matter of knowing what the rules are that they're playing with to know how to circumvent them.