Features of tractor units Compared to a full truck (rigid truck), the semi trailer truck with a tractor unit is extremely flexible and maneuverable:
You can connect a tractor unit to any semi trailers to build a truck for any purpose. For example, if you connect a tractor unit to a cement mixer trailer, you will get a cement trailer truck for transportation of concrete; if you connect a tractor unit to a refrigerated box, then you may delivery frozen food with this special trailer truck. Apparently, this combination is more flexible than a rigid truck.
Because the tractor unit is connected to a semi trailer by a fifth wheel, it’s easier for the driver to control the full truck’s movement, especially turning back. And it makes maintenance and changing more convenient.
