Winterizing is the term we used when preparing our trailers for winter storage. Dependent upon the age of an Airstream, the type of insulation used will vary although it's all fiberglass based. Any new Airstream trailer today will have the same insulation. The slideouts do use foil backed insulation in the floor (that's what I've been told by A/S).
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700