A Self Propelled Modular Transporter (SPMT) is a platform vehicle with a large array of wheels on the bottom. They are used for transporting massive objects such as bridges, oil refining equipment, huge motors, large bridge sections, and other objects that are too big or heavy for trucks but trucks can provide traction and braking for the SPMTs on inclines and decents. These vehicle may also be called a Self Propelled Modular Trailer.