Light trucks are trucks up to 14,000 pounds gross vehicle weight, including minivans and sport utility vehicles. Prior to the 2003 Benchmark Revision, light trucks were up to 10,000 pounds.
Source: US. Bureau of Economic Analysis
US. Bureau of Economic Analysis, Motor Vehicle Retail Sales: Foreign Light Weight Trucks [FLTRUCKSSA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/FLTRUCKSSA/, July 30, 2015.