I think the difference in 2000 was the fact that Airstream started using pre-finished aluminum panels from Alcoa. The EPA played havoc with the emissions from the coatings that Airstream used at the plant in the 90's. There were revisions made through the decade and you will find some 90's models that displayed various forms of premature clear coat peal as Airstream attempted to meet EPA guidelines by changing the formulas that were applied at Jackson Center. I think the later 90's trailers had the most issues. With all the problems, they finally threw in the towel and bought pre-finished aluminum from Alcoa, which if I remember correctly, began with the 2000 models.
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700