The type of CDL you need depends on the vehicle you plan to drive. There are three classes of CDL - Class A, Class B, and Class C. Class A allows you to drive a combination of vehicles with a total weight of 26,001 pounds or more. Class B allows you to drive a single vehicle with a weight of 26,001 pounds or more. Class C allows you to drive a single vehicle with a weight between 10,001 and 26,000 pounds.