Square cabin originated in the United States, initially used in the U.S. military, are equipped with a carrier, with high mobility, according to different needs, the corresponding structural design in its interior, the installation of related equipment, with specific functions. Widely used in the U.S. military mobile command system, communications, medical, logistics support, etc., is the U.S. military maneuvering forces, one of the important equipment.
In the 1950s and 1960s, the U.S. caravan unprecedented development, during which the introduction of the square cabin manufacturing process and structure, improve the reliability and applicability of the caravan, now we see all kinds of caravan most of the compartments for the car, the compartments of the material and structure of the form are similar to the square cabin.