If you receive a tow call for a semi-truck (or semi for short), it is easier than a tractor-trailer tow. You do not need to worry about dropping the driveline. Disconnecting the driveline can take some time but if you just towing the cab itself, you do not have to remove it. Therefore, you save time. You need only to connect to the rear of the truck; hook up to the rear axle and chain the front axle down and then you are own your way.
Our heavy duty pulling a loaded box truck from the rear.