A truck tractor is a combination of a power unit (engine and transmission) and a cab, which is used together with a semitrailer. When they are combined, they are referred to as a tractor/trailer unit, commonly known as a 'semi'. The trailer is a separate piece of equipment that attaches to the back of the tractor using a 'fifth-wheel' attachment.
On the other hand, a straight truck is a type of truck that carries cargo on the same chassis as the power unit and cab, making it a single piece of equipment. For example, refuse trucks that collect residential waste or box trucks used for residential delivery are considered straight trucks.
For more information HOWO Tractor Truck, please get in touch with us!