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.
A class 3 which would be a 1 ton truck with a dump bed will have a 14,000 lbs max weight limit. Subtract the weight of the truck from that and you will get the weight it can hold. A class the class 7 heavy truck weight limit is between 26,001- 33,000 lbs which is about the most you will see without tandem axles.