What do you do when you're a happy camper but your partner is less keen on a night under canvas? Wally Byam's solution was to invent the Airstream, which started in the late 1920s as a wooden platform atop the chassis of a Ford Model T and by 1937 was a sleek aluminum-clad trailer marketed as "an airplane without wings ... luxurious in the extreme." Here, @Smithsonianmag looks at the origin and evolution of this American classic.