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8. Why should you NEVER unlock the pintle hook with the dolly still under a trailer?
9. When coupling a second trailer to a doubles combination, what should you do with the shut-off valves on the first trailer?
10. Where should the shut-off valves be closed in a doubles or triples combination?
11. What is the proper position of the converter dolly air tank drain valve during operation?
12. What should you check regarding the safety chains when coupling a converter dolly?
13. When driving doubles or triples around a curve, you should:
14. What is the leading cause of rollover for doubles and triples combinations?
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