What type of trailer is a semi?
A semi-trailer truck, also known as a semi-truck, (or semi, eighteen-wheeler, big rig, tractor-trailer) is the combination of a tractor unit and one or more...
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A semi-trailer truck, also known as a semi-truck, (or semi, eighteen-wheeler, big rig, tractor-trailer) is the combination of a tractor unit and one or more...