Semi-trailer - Wikipedia
2021-11-18u2002·u2002A semi-trailer is a trailer without a front axle. In the United States, the term is also used to refer to the combination of a truck and a semi-trailer; a tractor-trailer.. A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer.The other portion of the semi-trailer's weight is semi ...
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