In coupling, when is the trailer height correct?
A. When the trailer landing gear is fully extended.
B. When the trailer will be lifted slightly when the tractor connects.
C. When the kingpin is about an inch above the fifth wheel.
Answer: B. When the trailer will be lifted slightly when the tractor connects.
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.