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    Semi-trailer - Wikipedia

    A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle … See more

    Semi-trailers were invented by August Fruehauf in 1914.
    Road tractors and semi-trailers are responsible for carrying a large proportion of cargo. With … See more

    Different types of semi-trailers are designed to haul different cargoes.
    Common widths are 8 ft (2.44 m), and 2.6 metres (102.36 in). Generally speaking, most North American type trailers use two axles with dual-tire hubs totaling 8 wheels, while most … See more

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    The two types of couplings are fifth-wheel coupling and automatic. In some applications, no separable coupling is fitted, and the trailer … See more

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    Nov 13, 2020 · Semi-trucks have a variety of trailer options to choose from. Depending on the type of cargo they need to transport and the size of their payload, this will determine the size and style of the trailer they will need for …