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There are 2 main classes of license drivers can train for at Truck Driving Schools. Each license allows the driver to operate a specific type and size of vehicle, and requires specific CDL training. Drivers may operate down in license class, but not up. For example, a driver with a Class A CDL license may drive Class B vehicles, but a Class B licensed driver may not drive Class A vehicles.
Class A Licensed drivers may drive any combination of vehicles with a GVWR of 26,001 or more pounds provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds.
Class B Licensed drivers may operate single vehicles (no tractor/trailer combinations) with a GVWR of 26,001 pounds or less, or any such vehicle towing a vehicle not in excess of 10,000 pounds.
Gross vehicle weight rating is the total weight of the vehicle and trailer when fully loaded.