Class B CDL holder is allowed to drive a commercial motor vehicle with a gross vehicle weight rating (GVWR) of 26,000 lbs. or more that may/may not tow a trailer that is 10,000 lbs. or less.
The difference between Class A and Class B licenses lies in the weight of the vehicles driven and towed. While a CDL is a license for vehicles that have a GVWR of over 26,001 or more, each class has a specific type of vehicles that a holder is legally allowed to drive.