Last name: Kiefer. This interesting and unusual surname is of Germanic origin, and is a metonymic occupational name for a maker or repairer of wooden vessels such as barrels, tubs, casks and vats. The derivation is from the German kief(e), kufe, itself coming from the Old High German kuofa, barrel.
Commercial Driver's License (CDL) A CDL is required to drive any of the following vehicles: Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
Drivers of semi-trailer trucks generally require a Class A commercial driver's license (CDL) to operate any combination vehicles with a gross combination weight rating (or GCWR) in excess of 26,000 lb (11,800 kg) if the gross vehicle weight rating (GVWR) of the towed vehicle(s) is in excess of 10,000 lb (4,500 kg).