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CLASS A: Any combination of vehicles with a gross combination weight rating of 26,001 pounds or more, provided the gross vehicle weight rating of the vehicle or vehicles towed exceeds 10,000 pounds; The gross combined weight rating is decided by the manufacturer. The GCWR of an F450 is 43,300 lbs per Ford Motor Company. The Gross vehicle weight rating of an F450 is 14,000 lbs. per Ford Motor Company. Even if your trailer is rated at 12,000 lbs., or less, you would still need a class A license.