When hooking a tractor to a trailer, you'll know the trailer is at the correct height when the:
A. Kingpin is about 2 ¼ inches above the fifth wheel.
B. Beginning of the kingpin is even with the top of the lower fifth wheel plate.
C. The coupling device of the trailer is just below the middle of the tractor fifth wheel.
Answer: C. The coupling device of the trailer is just below the middle of the tractor fifth wheel.
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.