According to the U.S. Census Bureau’s 2002 Vehicle Inventory and Use survey, a “heavy” truck classification refers to a vehicle with an average weight of between 19,501 -26,000 pounds or more. The survey breaks this category down into “light-heavy” and “heavy-heavy.” Light-heavy is the range between 19,501-26,000, and heavy-heavy refers to vehicles that weigh more than 26,000 pounds.