A job that involves a combination of both powertrain engineering and vehicle dynamics is that of a power mechanic.
Front
That depends on the Gross Vehicle Weight Rating of the vehicle you're driving, or the Gross Combination Weight Rating of the truck and trailer you're operating, if operating a combination vehicle. Other factors come into play, as well, such as if it's a registered commercial vehicle or a registered farm vehicle.
The cargo, the trailer, and the weight of the vehicle.
Single vehicles with a Gross Vehicle Weight Rating of more than 26,000 lbs., and combination vehicle with a Gross Combination Weight Rating of more than 26,000 lbs., when the vehicle in tow does not have a weight rating in excess of 10,000 lbs.
Single vehicle with a Gross Vehicle Weight Rating of more than 26,000 lbs., or a combination with a Gross Combination Weight Rating of more than 26,000 lbs., in which the vehicle in tow has a weight rating of 10,000 lbs. or less.
3 psi/minute single vehicle, 4 psi/minute combination vehicle.
Class B is for any single vehicle with a Gross Vehicle Weight Rating of more than 26,000 lbs., or for combination vehicles with a Gross Combination Weight Rating of over 26,000 lbs., provided that the vehicle in tow (trailer) is not rated at over 10,000 lbs.
If the gross vehicle weight rating of the vehicle or combination is over 26,000 lbs, and the vehicle isn't exempted from CDL requirements (farm use vehicle, fire fighting apparatus, recreational vehicle, etc) then yes.
States issue a CDL according to the CDL License classifications listed below. Group A (Combination Vehicle) CDL License Any combination of vehicles with a gross combination weight rating (GCWR) of 26,001 pounds or more provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds. Group B (Heavy Straight Vehicle) CDL License Any single vehicle with a GVWR of 26,001 pounds or more, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR. Group C (Small Vehicle) CDL License Any single vehicle, or combination of vehicles, that meets neither the definition of Group A nor that of Group B, but that either is designed to transport 16 or more passengers including the driver, or is used in the transportation of Hazardous Materials.
Yes. Having said that, if your commercial vehicle is a combination vehicle, the front plate goes on the tractor and the back plate on the trailer; the tractor won't have a back plate.
For a state which has a non-CDL A, B, and C license system, the weight requirements are the same as they are for the equivalent CDL classes, which are:Class A: Gross Combination Weight of more than 26,000 lbs., in which the Gross Vehicle Weight Rating of the vehicle in tow is in excess of 26,000 lbs.Class B: Single vehicles with a Gross Vehicle Weight Rating in excess of 26,000 lbs., and combination vehicles with a Gross Combination Weight Rating in excess of 26,000 lbs., so long as the vehicle in tow does not have a Gross Vehicle Weight Rating in excess of 10,000 lbs.Class C: Single vehicles and combinations with a Gross Vehicle Weight Rating/Gross Combination Weight Rating of 26,000 lbs. or less.