High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! In American English, a semi-trailer is a trailer without a front axle. A large proportion of its weight is supported by a road tractor, by a detachable front axle assembly known as a dolly, or by the tail of another trailer. A semi-trailer is normally equipped with legs which can be lowered to support it when it is uncoupled. A road tractor coupled to a semi-trailer is often called a semi-trailer truck or semi. Though most road trailers meet this definition, the term is most often applied to heavy trailers appropriate for use in such a rig.

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