Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
The only recent Airstream that I am aware of that did not come from the factory as fully self-contained is the Base Camp.
There are probably some others that were rendered that way by imaginative prior owners.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)