Practice question

Why does high coupling matter in combination-vehicle operation?

  1. Drive if the trailer seems heavy
  2. Use the hand valve to pull the kingpin down
  3. Raise the landing gear and ignore the gap
  4. High coupling can occur when the kingpin rides over closed fifth wheel jaws instead of locking.

Answer: D — High coupling can occur when the kingpin rides over closed fifth wheel jaws instead of locking.

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