I just purchased a 2010 Monaco 31' Monarch. It has one roof air. We're currently in Tucson and the air flow seems weak and doesn't cool the coach down. It's very unpleasant, actually. Anyone have any experience with one roof a/c on a 31 footer? Is it adequate? Air seems to come out quite good from 3 vents but very little air flow from the others. Any comments and/or advice would be appreciated. We also drove over some rough streets here in Tucson and there is a huge rattle below the engine compartment (almost sounds like a loose muffler or something). I can't see anything loose below, though, including the muffler and exhaust. Is that common with MH's............lots of noise? We're new to this. Thank you.