If the trailer is too low when you back under it, what can happen?

• A.Nothing, low trailers couple more easily
• B.The kingpin will always find the jaws
• C.The tractor frame or fifth wheel can strike the trailer, and the kingpin may miss or damage the apron
• D.Only the mud flaps can be damaged

Why

A low trailer puts its apron in the path of the tractor frame and tires instead of on top of the fifth wheel. Raising the trailer to the correct height before backing prevents that contact damage.

Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-025).

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?