Trucks are Commercial Motor Vehicles which are classified into eight classes in the United States, clubbed into three major categories -  -Light-duty -Medium-duty -Heavy-duty Light-duty trucks include commercial truck classes 1, 2, and 3 (minivans, SUVs, pickups, tow trucks).  -Class 1: Trucks having a Gross Vehicle Weight Rating (GVWR) of 0–6,000 pounds. -Class 2: Trucks having a GVWR of 6,001–10,000 pounds. The medium-duty trucks include commercial truck classes 4, 5, and 6 (van, recreational vehicle, box truck, flatbed truck) -Class 3: Trucks having a GVWR of 10,001–14,000 pounds. -Class 4: Trucks having a GVWR of 14,001–16,000 pounds. -Class 5: Trucks having a GVWR of 16,001–19,500 pounds. -Class 6: Trucks having a GVWR of 19,501–26,000 pounds. The heavy-duty trucks include commercial truck classes 7 and 8 (tractor-trailers, cement mixers, dump trucks, log carriers). -Class 7: Trucks having a GVWR of 26,001 to 33,000 pounds. -Class 8: Trucks having a GVWR of greater than 33,001 pounds