The category is Tractor Units (Articulated): A tractor unit (also known as a prime mover, tractor, truck, semi-truck, semi-tractor, rig, big rig, or simply, a tractor) is a characteristically heavy-duty towing engine that provides motive power for hauling a towed or trailered-load.
Parent categories: Vehicles, Accessories & Parts
Related categories:
Agriculture Machinery, Equipment, Services & Shipping
Airline & Airport Operations