Are vehicle configurations recorded in the FMCSA SAFETYNET database consisting of any single-unit truck with an attached trailer for hauling cargo. When truck trailers posess two different cargo body types between the truck and its attached trailer, select the cargo body type for the power unit (truck) in the combination. If the truck has no applicable cargo body type, use the trailer's cargo body type. Also of note, truck trailers can include light trucks (less than 10,000 lbs. GVWR) pulling trailers that increase the GCWR to over 10,000 lbs.