Moving trailer floorThe company's lightweight Walking Floor system replaces an existing trailer floor with one that self-unloads refuse, green waste, aluminum, and other materials. A hydraulic unit powers floor slats to convey the material. The product is not limited by the same vertical height requirements that limit use of dump trailers. Heavy-duty floors for handling highly abrasive floors are available. Keith Manufacturing Co. www.keithwalkingfloor.com.