Question 50 of 120

After connecting a dolly to the lead trailer, why should you attempt to pull forward slightly before fully trusting the coupling?

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Pulling forward has no diagnostic value for this type of coupling
It's done only to reposition the dolly for photographs during a routine inspection for the maintenance file, nothing more
It warms up the tires before the trip begins
A gentle tug tests that the coupling actually holds under tension rather than just appearing connected

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Correct answer to question 50 (Doubles/Triples): A gentle tug tests that the coupling actually holds under tension rather than just appearing connected

Why

A coupling that looks closed can still fail to hold; a light forward pull against it is what actually proves the connection will stay together once the combination is moving.

Updated: November 2026

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After connecting a dolly to the lead trailer, why should you attempt to pull forward slightly before fully trusting the coupling?

Why

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