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A semi-trailer truck [1] (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.

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May 1, 2024 · Tractor trailers, also referred to as semi-trucks or 18-wheelers, consist of a tractor unit and a detachable trailer. The tractor unit contains the engine, driver’s cab, and controls, while the trailer provides the cargo space.

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