Abstract: A portable building of the type having a floor, side walls and a roof structurally interconnected to form an integral building unit, the building also including skid means for engaging the ground and supporting the building in a free-standing condition, reinforced slide means being formed beneath the building floor for engaging and supporting structural chassis members of a transport vehicle while withstanding stress of sliding the building onto and off of the vehicle during loading and unloading, and means structurally interconnected with the building for sliding it onto and off of the vehicle, the building preferably being of modular construction and including self-contained service means such as air conditioning, electrical service and the like.