Different from semi-trailer, semi-trailer axles is at the vehicle centre of gravity (when the vehicle even when loaded), and can be horizontal or vertical transmission to the towing coupling devices for trailers! General trailer two axle, trailer a shaft. Semi, refers to itself without power, with the main shared hosting relies on primary car traction vehicles.
Simply put, full trailer connected to the front truck with hook, is common in long distance transportation cart hanging behind a car (can be more than one), the full trailer. Semi-trailer is connected by a PIN with tractor traction, common is a typical semi-trailer container transport car, is the semi-trailer loading section later.