We have the new LNB and we spend time in Arizona and southern California. We haven't had a problem aiming a manual dish or now an auto dish on the roof. You look for one of the 2 older sats to aim, not the new third one. You won't get programs from the third sat as it's ranged and doesn't get signals anywhere south of the Canadian border, but most of the same programs exist on the two older sats.
By the way, you need two coax lines into your RV to use the PVR to record programs, I'm not sure if the PVR works with only one coax line, I couldn't get mine to work just with one (maybe you have to do some programming to eliminate the PVR portion).