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Cabover (Cab-Over-Engine, COE)
Truck or tractor design in which the cab sits over the engine on the chassis.
GVW (Gross Vehicle Weight)
Total weight of a vehicle and everything aboard, including its load.
Kingpin
Pin around which a steer axle's wheels pivot.
GAWR (Gross Axle Weight Rating)
Maximum weight an axle is rated to carry by the manufacturer. Includes both the weight of the axle and the portion of a vehicle's weight carried by the axle.
Sliding Tandem (Slider)
Mechanism that allows a tandem axle suspension to be moved back and forth at the rear of a semitrailer, for the purpose of adjusting the distribution of weight between the axles and fifth wheel.
Bobtail Tractor
Tractor operating without a trailer. Also refers to straight truck. Bogie (also spelled bogey) Assembly of two or more axles, usually a pair in tandem. Brake Horsepower (bhp) Engine horsepower rating as determined by brake dynamometer testing. (see Horsepower)
Fixed Tandem
Assembly of two axles and suspension that is attached to the chassis in one place, and cannot be moved fore and aft
Tandem Axle (Tandems)
Pair of axles and associated suspension usually located close together.
Cargo Weight
Combined weight of all loads, gear and supplies on a vehicle.
Dead-Heading
Operating a truck without cargo.
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