A semi-trailer and a full trailer can be distinguished based on their design and how they are connected to the towing vehicle:
Semi-trailer: A semi-trailer has only one set of wheels at the rear, and it relies on the towing vehicle for support at the front. The semi-trailer is attached to the towing vehicle through a coupling at the rear of the vehicle, with part of its weight supported by the truck. The semi-trailer cannot function independently and requires a towing vehicle to operate.
: A full trailer has both front and rear axles and is fully supported by its own wheels. It can operate independently of the towing vehicle, meaning it has a complete axle system for support and does not rely on the towing vehicle to carry part of its load. The full trailer is connected to the towing vehicle with a hitch at the front, but it carries its own weight.
In short, the key difference is that a semi-trailer has no front axle and is dependent on the towing vehicle for support, while a full trailer has both a front and rear axle, making it fully supported by its own wheels.
