I also have a 2000 Rexhall Aerbus (3550BL, I believe) w/ 2 slides, on a Ford chassis with a V10. I have owned this MH for a 3-1/2 years and this is our third MH.
We are very happy with this MH. We have been on several extended trips with it, either towing a Chevy Colorado pickup or a 16' enclosed trailer with a touring sized motorcycle inside. It has handled these towing tasks very well.
The overall build quality is very good. We have approx. 46K miles on the MH now and it is still essentially void of rattles, etc.
We have been fortunate also with all the systems (slides, levelers, appliances, plumbing, electrical). We've had occasional issues, but nothing major.
On the negative side, I've noticed that when traveling in hot weather and stopping in a campground, the roof AC unit takes quite a bit of time to cool the inside of the MH. We have a 30A service and can only run one AC unit at a time, and I believe the heat from the engine and the overall temperature of the motorhome overcomes the cooling capacity of the AC unit for quite a while.
Also, in cold weather (20 degrees or less), the heating capacity could be better. It would also help if the MH itself was "tighter". I would say it's somewhat drafty when the wind is blowing. Dual pane windows might help as well.
Welcome aboard! RVing is a great lifestyle, enjoy!
2002 Newmar MountainAire DP, Spartan Chassis
2005 Chevy Colorado Toad