One of the most critical repair works we offer is on the frame or the inner structure of the car. It is important to bear in mind that vehicles differ in their frame structures. Pickup trucks, for instance, have a heavy duty bolted steel frame which is built in several separate pieces. Many cars, on the other hand, have frames made with HSS (or High Strength Steel), and have more complex requirements. Manufacturers such as mercedes-benz and BMW have aluminum frames and specify a strict set of guidelines for repairing their cars. They grant their guidelines only to those who have the requisite certifications top reconstruct manufactured cars.