hen Airstream Inc. displayed its $8,000 trailer at the Trailer Life Show in Los Angeles in 1954, the sleek aluminum chariot known as the “Land Yacht” was already as iconic as Route 66. Debuting in 1936, Airstream is the only one of 300 trailer makers to survive the Depression. Since then, its trailers have rolled into pop-culture fame, quarantining the Apollo 11 astronauts after the first moon flight, and housing Paris Hilton during the filming of “The Simple Life.” With a trailer currently on exhibit in the Smithsonian Institution, an estimated 60 percent of all trailers Airstream built are still rolling.