The length is either 48 feet or 53 feet, and the width of 96 or 102 inches. Types of Trailers Flatbed Trailerįlatbed trailers are the most popular and common of the semi-trailer used today. Read below for a list of the different types of trailers for semi-trucks. The first semi-trailer is connected to the power unit using the tractor’s fifth wheel coupling while the converter dolly, already attached to the second semi-trailer, is connected to the first semi-trailer with a drawbar. A double-trailer combination is possible with the use of a dolly, or “converter dolly”, essentially one to three additional axles placed under the front of a second semi-trailer. Other terms used are “B-train” or (when there are three or more trailers) “road train”. Semi-trailers with two trailer units are called tandem tractor-trailers tandem rigs or doubles. Ease of backing is cited as one of the semi’s best advantages. Many trailers have wheels that are capable of being totally dismounted and are also relocatable (repositionable) to better distribute the load to bearing wheel weight factors Semi-trailers are more popular for transport than full trailers, which have both front and rear axles. A trailer is normally equipped with landing gear (legs which can be lowered) to support it when it is uncoupled. In the United States, the term is also used to refer to the combination of a truck and a trailer also called a tractor-trailer.Ī 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. So, what is a trailer? What are the different types of trailers for semi-trucks? A semi-trailer is a trailer without a front axle. This article will cover the different types of trailers for semi-trucks.
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