It looks like Airstream made a 22' Globetrotter model in 1949.
I couldn't find any reference to this year-model-length in the Vintage Airstream photo archives website. Has anyone else heard of this year-model-length?
Check out this eBay ad and see the attached floorplan.
From looking at the floorplan, it looks like Airstream offered a couple of different floorplan options for this model (i.e., twin vs. full bed; front gaucho vs. chairs vs. love seats).