3. Launched in 1936, the first Airstream slept four.
And it cost only $1,200 ($20,265.13 in today's dollars). However, founder Wally Byam had undercut himself four years earlier by writing an article called: “How to Build a Trailer for One Hundred Dollars." It sold 15,000 copies, at $1 each. These original models carried their own water supply.