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Why should you keep the tractor and trailer straight during uncoupling?
- A.Straight parking only looks better
- B.A jackknifed or angled position puts side stress on the kingpin and gear and makes the trailer less stable when left
- C.Angled uncoupling raises the trailer
- D.It matters only for doubles
Correct answer
B. A jackknifed or angled position puts side stress on the kingpin and gear and makes the trailer less stable when left
Why
Side loads can jam the jaws and twist landing gear legs that are designed for vertical loads. Straight and level leaves the trailer standing as its gear was designed to hold it.
Manual topic: Combination Vehicles - Uncoupling · From the Combination Vehicles practice bank (CV-060).