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A tractor trailer is a combination of a tractor unit, which is the vehicle's power unit, and a semitrailer, which is attached to the tractor unit. The tractor unit is typically a heavy-duty truck used to pull the trailer. The semitrailer is a large trailer, usually a flatbed, which carries the cargo. Tractor trailers transport large and heavy loads such as construction materials, agricultural
A tractor trailer is a combination of a tractor unit, which is the vehicle's power unit, and a