A commercial Class B license, also called a Class B CDL, is required to operate commercial trucks or large busses that weight more than 26,000 pounds. With this license, you’ll be able to drive straight trucks, segmented buses, city buses, school buses, tourist buses, box trucks, dump trucks, delivery trucks, and other similar vehicles. You may need an appropriate endorsement for certain vehicles, however. In fact, with proper endorsements, you might also be qualified to operate certain Class C vehicles.