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Why Buy a Category B+ Driving License? You'll require a Class B license when you need to drive a car with a trailer that weighs more than 26,000 pounds. An endorsement for your current CDL class is typically a matter of taking another knowledge test and a skills test. A successful passing of a test in category C1+E will allow you to upgrade your license to include the full B+E eligibility. (Subject to the weight limit of your B licence.) T