Abstract: A drop down for floor access, laterally expanding for space, stressed structure for finesse, trailer or portable building that consists of two telescoping open span box shells of space tube type construction with a novel suspension attached both near the floor and near the ceiling that allows walk through floor space between the wheels when the thin trailer floor is sitting on roadway surface in the drop down mode. A “glide-over” box shell section travels on overhead “drawer-slide”apparatus during extensions-retraction and twin overhead “T” beams captivate a combination double foam weather seal and travel stop during extension.

Abstract: A drop down for floor access, laterally expanding for space, stressed structure for finesse, trailer or portable building that consists of two telescoping open span box shells of space tube type construction with a novel suspension attached both near the floor and near the ceiling that allows walk through floor space between the wheels when the thin trailer floor is sitting on roadway surface in the drop down mode. A “glide-over” box shell section travels on overhead “drawer-slide” apparatus during extension-retraction and twin overhead “I” beams captivate a combination double foam weather seal and travel stop during extension.