Tractor unit

A tractor unit is a big vehicle that helps carry heavy things like trailers or other big vehicles. It's kind of like a really strong animal that pulls a wagon. The tractor unit has a very powerful engine and big wheels that can move a lot of weight. But unlike an animal, a tractor unit is driven by a person who sits in a comfy seat inside a special cab. The cab is like a little room with a steering wheel and pedals, just like a car. The driver uses the steering wheel to control where the tractor unit goes and uses the pedals to make it go faster or slower. The trailer or other big vehicle is connected to the tractor unit with something called a hitch. The hitch helps keep everything connected so that the tractor unit can do its job of moving heavy things around.