low bed semi trailer It is a scientific and technical term for highway traffic published in 1996.Trailer refers to a vehicle that is towed by a car without its own power drive device. A combination of one car (truck or tractor, forklift) and one or more trailers. Trucks and tractors are the driving car sections of car trains and are called main cars. The driven vehicle section towed by the main vehicle is called a trailer. It is an important vehicle type for road transportation, and the use of automobile and train transportation is the most effective and simple important means to improve economic efficiency. It has the advantages of speed, maneuverability, flexibility, safety, etc.; it can easily realize section transportation.