Currently, we have 3 dual tuner dvrs and one single. is it time to jump to the Hopper/Joeys? We have 6 TV's, but only 3 are HD so would we need 2 Hoppers/ 4 Joeys to keep all 6 on separate tuners? i'm guessing the monthly price would be close to the same...Also, could a Hopper be used for a "short" (weekend) time in an RV?