Hi, we (Ron & Donna) are new owners of a 1997 U320 and like all new owners we have a few questions for the experts here on the forums. Our unit is number 5032 and is 40ft long. Our initial outing was when we picked it up in Oklahoma and then drove it 2000 miles to Oregon. The first thing that I noticed was that my back wasn't hurting after the first long days drive,...