You back under and the kingpin locks, but the trailer was sitting with its apron well above the fifth wheel. What should you do?

• A.Uncouple, lower the trailer to the correct height, and couple again correctly
• B.Drive slowly and let the weight settle it
• C.Add grease and pull forward hard
• D.Raise the landing gear to force it down

Why

A high hook will not fix itself under load and can separate in travel. The only correct repair is to redo the coupling at the proper height.

Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-030).

Practice this subject as a full test

More Fifth Wheel & Coupling Steps questions

• Before backing under a trailer, what should you first check about the trailer's height?
• What is the correct way to approach a trailer when starting to couple?
• Just before the fifth wheel contacts the trailer apron, what should you do?
• Why should you back very slowly for the last part of coupling?
• When you first back under and hear the fifth wheel lock, what is the next safety check?