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Why Buy a Category B+ Driving License? You'll need a Class B license in order to operate a vehicle with a trailer that weighs more than 26,000 pounds. It is possible to add an endorsement the CDL class you already hold by passing a new knowledge and skills test. Achieving a pass in a test for category C1+E automatically upgrades your license to include B+E full entitlement (but subject to the maximum weight limit for trains on your B license). This is only available to UK drivers. Passenger Endorsements If