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A tractor and a semi-trailer are being coupled. Although you have backed up, you are not yet beneath it. Which of the below should you hook up before backing under the semi-trailer?
the emergency and service airlines.
the electrical service cable.
nothing. Back up and lock the fifth wheel.
Detailed Explanation (Get    to show this content)
*** **** **** *** ******* ****** ****** ******* ******* *** *******, ***** ******** **** *** ***** ******* **** *** ******* ****** *** *********. ***** ******* *** ******* ******, ******* *** ********* *** ******* ********.*
*********** ******** ******* *******
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