Land Yachts, Portable Palaces, Corrugated Condosโwhatever the name, travel trailers and RVs have become an American iconโthe 20th centuryโs covered wagon. Hit the road as we travel with recreational vehiclesโfrom early versions built on the back of Model-T Fords, to roadside towns known as Hoovervilles during the Depression and WWII โtrailer townsโ set up for workers near munitions plants or aircraft factories, to modern RVs that resemble mansions on wheels and can cost nearly a million dollars!