Basic body materials are steel, stainless steel, fiberglass and aluminum. Various configurations. Single wheel or dual wheel rear axles. Ladder racks, compartment options, tie downs in corners of box, e-track in box, lights in compartments, headache racks, master locks for compartments, bumper hitches, bolt on flip top compartments on top of side packs. Optional support in corner compartments for crane application. Adjustable shelving in all compartments with dividers.