You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should
a) Back up gently to ease pressure on the fifth wheel locking jaws
b) Begin to lower the trailer landing gear
c) Immediately apply your tractor parking
Answer: a) Back up gently to ease pressure on the fifth wheel locking jaws
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.