1. Different properties: semi-trailer tractor is a commercial vehicle equipped with special devices for towing semi-trailer. A semi-trailer is a trailer whose axle is placed behind the center of gravity of the vehicle (when the vehicle is uniformly loaded) and is equipped with a coupling device that can transfer horizontal and vertical forces to the tractor.
2. Different types: semi trailers are generally three axle semi trailers, which are divided into eleven meter warehouse fence semi-trailer, thirteen meter warehouse fence semi-trailer, low flat plate semi-trailer and so on. Semi trailer tractor does not.
3. Different center of gravity points: a semi-trailer is a trailer whose axle is placed behind the center of gravity of the vehicle (when the vehicle is uniformly loaded) and is equipped with a coupling device that can transfer horizontal or vertical force to the tractor. The semi-trailer itself has no power and carries the vehicle driven by the main vehicle together with the main vehicle.
