A semi-trailer is a trailer whose axle is located behind the vehicle's center of gravity (when the vehicle is evenly loaded) and equipped with a coupling device that transmits horizontal and vertical forces to the tractor. Semi-trailers are generally three-axle trailers, and they come in many types, including 11-meter stake semi-trailers, 13-meter stake semi-trailers, and low-flatbed semi-trailers. They are heavy-duty transport vehicles connected to the tractor unit via a towing pin.
Compared to monocoque trucks, semi-trailers can significantly improve the overall economic efficiency of road transport. Transport efficiency can be increased by 30-50%, costs reduced by 30-40%, and fuel consumption decreased by 20-30%. More importantly, the use of semi-trailers can also promote the organization of logistics in my country to a certain extent.
