Entry-Level Driver Training (ELDT)

What is the primary purpose of performing a 'tug test' after coupling?

To check if the trailer's service brakes are working. To ensure the fifth wheel's locking jaws have securely engaged the trailer's kingpin. To confirm that the air and electrical lines are properly connected. To settle the cargo inside the trailer before departure.

Correct Answer:

To ensure the fifth wheel's locking jaws have securely engaged the trailer's kingpin.

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