English: Diagram showing a side view and underside of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside view are the axles, drive shaft, and differentials. The legend for labeled parts of the truck is as follows:
tractor unit
semi-trailer (detachable)
engine compartment
cabin
sleeper (not present in all trucks)
air dam
fuel tanks
fifth-wheel coupling
enclosed cargo space
landing gear - legs for when semi-trailer is detached
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{{Information |Description={{en|1=Diagram showing a side view and underside of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space.<br/>The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside
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