Thanks Shari . . . your AS knowledge far exceeds mine.
Just shooting from the hip here . . . the inside of the main door and the side window suggest something at least from the 1980's, or maybe newer IMO.
Noted -- significance unknown:
-- No fixed glass in the door
-- No panoramic windows
-- No plexi rock guards over the front windows
-- No SS segment protector over the lower corner
-- Is that yellow marker light a good clue?
-- The weathered "AIRSTREAM" over the window -- is the font a clue?
No other clues on FB?