Was there a 1940s Airstream 4000s serial number series and if so does anyone know the name and/or history?
Also the 1949 21' Airstream at Shady Dell Trailer Park Arizona isn't a Liner but they don't mention the name. It is very similar in style to my 1949 Trailwind but larger.
From vintageairstream I know the following s/n models were used during the 1940s:
30xx Wee Wind (fewer than 100)
50xx Trailwind (fewer than 100)
80xx Whirlwind (appears to just be a handful)
Any help would be appreciated.