A semitrailer is a road vehicle for the carriage of goods without front axle, conceived so that a part of the vehicle and a great part of its loading rest on the road tractor. The term "semitrailer" is sometimes used to define a road unit made up of a vehicle intended to tow, the tractor, and a trailer intended to carry the transported goods. The trailer is harnessed on the tractor with a platform named fifth wheel.

The principal makes (or carriage-builders) of trailers and semitrailers in Europe are:

Benalu | Chereau | Fruehauf | General Trailer | Kaiser | Krone | Lamberet | Samro | Schmitz Cargobull | Trailor | Trouillet

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