What is a Semi-Trailer?
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A semi-trailer is a type of trailer where the axles are positioned behind the vehicle's center of gravity (when the vehicle is evenly loaded) and is equipped with a coupling device that transmits both horizontal and vertical forces to the tractor. Here are the details: Uses of Semi-Trailers: Semi-trailers are primarily used to transport large, indivisible cargo, such as excavators. Flatbed or fence-style trailers are suitable for hauling perishable goods like vegetables and fruits, while enclosed or box-style trailers are ideal for bulk goods and moisture-sensitive or high-value cargo. Differences Between Semi-Trailers and Full Trailers: Unlike full trailers, semi-trailers have their axles positioned behind the vehicle's center of gravity (when evenly loaded) and feature a coupling device that transmits forces to the tractor. Typically, full trailers have two axles, while semi-trailers have one. A semi-trailer lacks its own power and relies on the tractor for both support and movement. Simply put, full trailers connect to the truck via a hitch, whereas semi-trailers attach to the tractor's fifth wheel using a kingpin. A common example is the container transport vehicle, where the rear loading section is a semi-trailer. Their uses also differ: full trailers are mainly for short-distance transport within factories, ports, docks, or warehouses, while semi-trailers are designed for long-haul cargo transportation.
