The semi-trailer is different from the full trailer. The semi-trailer is placed behind the center of gravity of the vehicle (when the vehicle is evenly loaded) and is equipped with a trailer that can transmit horizontal or vertical force to the coupling of the tractor! Generally, two axles for a trailer, one axle for a semi-trailer, and a semi-trailer, which means that they have no power, and bear the vehicle that is driven by the main vehicle together with the main vehicle.
Simply put, the trailer is connected to the front truck by a hook. The semi-trailer is connected to the traction seat of the tractor through the traction pin. The common container transporter is a typical semi-trailer train, and the rear loading part is a semi-trailer.
There are also differences in use. The trailers are mainly used for short-distance transportation in factories, ports, terminals, warehouses, etc., while semi-trailers are mainly used for long-distance transportation of goods.