While coupling a second trailer using a converter dolly, what should you confirm before driving away?
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Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 17 (Doubles/Triples): That the dolly's tow bar, safety chains, and air and electrical lines are all properly connected and secured
Why
A dolly coupling isn't complete until the tow bar, safety chains, and both the air and electrical lines are all connected, since missing any one of them leaves a real safety gap.
Updated: November 2026