Though interestingly to make sure all receivers remained on the same premises, DIRECTV LA, specifically SKY Mexico, during the era of legacy multiswitches required security devices known as "Pairing Bridges" be installed between the multiswitch and the receivers to allow multiple receivers on an account to communicate with all others through some kind of data link.Absolutely. All that the HS17 does is return the situation to how it used to be, and close the multiple location loophole.
But you are correct, DirecTV will have to come up with a proper policy for RVs. HS17s won't even work with a round dish (using an SWM multiswitch) now that they have removed the dish selection option.
If any receiver could not communicate with all the others assigned to the same account, then all the receivers would shutdown as unauthorized to display programming.
DIRECTV never implemented such a system for DIRECTV USA of course, but I guess such a method for the much larger number of subscribers here would have been too expensive, cause increased complexity by adding another major component to the dish install chain. And be difficult to scale since I never saw any of these Pairing Bridges with more than a 4x4 capacity for linking up to 4 receivers.