Pennsylvania CDL Double/Triple Trailers Practice Test

Before coupling a converter dolly to the rear trailer, what should you do to the rear trailer?

Leave it free to roll so it can align itself Secure it with brakes or chocks and check that it is at the correct height Raise the landing gear fully before coupling Open all rear shut-off valves

Correct Answer:

Secure it with brakes or chocks and check that it is at the correct height

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