OK. I activated my RV 612 and just slipped in a "by the way can us RVers keep a VIP in our RV?
Final absolute answer is: "Not no, but hell no!" Or it sounded a lot like that to me. And you can put a Hopper in your RV(if your rich) but since they are on separate accounts the EHDs could not move between the RV and house.
Oh and they tried to get by at first by saying that if I had a say 211 in my RV(even though they just activated my RV 612), it's EHD isn't compatible with a hopper EHD. But I pressed them and made them actually say: "no how, no way, not gonna happen"