There is not really such a thing as an RV only account. You can use any receiver in any location without restriction as long as you own/rent the properties/vehicles where the hardware is being used.
The only thing that is slightly "RV account" related is that some DirecTV customers sign up for the DNS services (Distant Network Services) but you stay at one location for an extended period you can also call and have your service location changed.
What does not work is trying to have receivers working at 2/3 different locations simultaneously so as long as you will only need service at the location where you are physically located then there are really no issues.