You are hooking a tractor to a semi-trailer and have backed up but are not under it. What should you do before backing under the trailer?
A. Hook up the electrical service cable.
B. Hook up the emergency and service air lines.
C. Nothing, back under the trailer and secure the fifth wheel.
Answer: B. Hook up the emergency and service air lines.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.