Ruthe and all,
We went through the same thing when we were first looking about ten years ago. The beds on the smaller Airstreams are just too small, plus the extra weight and cost. I also cruised Air Forum for a while where they posted threads on problems with each new model year as they came out. The lists were often quite extensive. Then we were camping at Klamath Lake in Southern Oregon and a Scamp pulled in. We'd never seen or heard of a molded fiberglass trailer. We ended up with a Casita FD - had a blast with it, recently retired and were feeling a little cramped on longer trips, along came Reace and Tammy to Bandon with the 21 and the rest, as they say, is history.