Hey, skyking,
Thought of you when I was perusing the national for sale ads the other day. There is a 1989 AVION 5'er for sale in Fairview, AL:
$8,900
Have you ever done a comparison from the earlier, higher-quality build trailers to the "nameplate" version AVIONs of later years? Was wondering if the (potentially) lower ground clearance would make for fewer changes for an equal mpg increase; or if roof height was lower (obviously, I haven't checked published spec). Maybe you are aware of deficiencies -- or other -- that I am not. Thought maybe someone looking for an "aero" 5'er might benefit if you already knew (according to gogitating you've already done). This is a good "big trailer" by design (mated to the proper TV, a CTD!)
http://rjmarq.org/airstream190/image..._5th_wheel.jpg
.