Classes 7 and 8 tend to include the heftier commercial trucks, with Class 7 covering more of the city-based vehicles like garbage and recycling trucks, or any truck weighing 26,001 to 30,000 pounds.

The U.S. Department of Transportation uses a tiered ranking of eight classifications for trucks, with the larger numbers corresponding to an increase in gross vehicle weight. Classes 7 and 8 tend ...