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8. Which of the following helps prevent jackknifing in a doubles or triples combination?
9. When coupling a converter dolly to a second trailer, the dolly air tank should be:
10. What happens if you leave the shut-off valves closed on the first trailer of a doubles combination?
11. When uncoupling the rear trailer of a triples combination, the first step is to:
12. A converter dolly has its own:
13. The pintle hook is located on which part of the combination vehicle?
14. At highway speeds, doubles and triples are more likely to roll over than single combination vehicles because:
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