Question 3 of 140

After backing the tractor under the trailer and locking the fifth wheel, how do you confirm the coupling is secure?

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Visually check from a distance only, without physically testing that the coupling holds
Check only the air line connections
Pull the tractor forward gently against the locked fifth wheel to test that it holds
Rely on the sound of the jaws closing

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Correct answer to question 3 (Combination Vehicles): Pull the tractor forward gently against the locked fifth wheel to test that it holds

Why

A gentle forward pull against the locked fifth wheel physically tests that the coupling holds, which a visual check or the sound of the jaws closing cannot confirm.

Updated: November 2026

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After backing the tractor under the trailer and locking the fifth wheel, how do you confirm the coupling is secure?

Why

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