Question 54 of 140

After coupling, you cannot see the kingpin well enough to confirm by eye that it is captured in the fifth wheel's jaws. What should you do?

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Assume it is fine if the pull test doesn't move the trailer
Crawl under the trailer to visually confirm the jaws are closed around the kingpin before driving
Skip the visual check if the locking indicator light is not lit either way and trust the pull test
Tap the brakes a few times, since a proper coupling always releases a clicking sound

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Correct answer to question 54 (Combination Vehicles): Crawl under the trailer to visually confirm the jaws are closed around the kingpin before driving

Why

A pull test alone can feel secure even on a coupling that isn't fully locked, so when the view is unclear, physically checking under the trailer is the only way to be certain the jaws closed around the kingpin.

Updated: November 2026

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After coupling, you cannot see the kingpin well enough to confirm by eye that it is captured in the fifth wheel's jaws. What should you do?

Why

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