Before backing under the trailer, you should check the height of the trailer. It should be:

Slightly lower than the fifth wheel, so the trailer is lifted slightly when the tractor backs under it.. Section 6.4: The trailer should be

Before backing under the trailer, you should check the height of the trailer. It should be:

ANSWER BREAKDOWN
  • A. Incorrect. "Higher than the fifth wheel." is not correct. The trailer should be low enough that it is raised slightly by the tractor when you back under it. This ensures contact.
  • B. Incorrect. "Lower than the fifth wheel." is not correct. The trailer should be low enough that it is raised slightly by the tractor when you back under it. This ensures contact.
  • C. Correct. The trailer should be low enough that it is raised slightly by the tractor when you back under it. This ensures contact.
  • D. Incorrect. "It doesn't matter." is not correct. The trailer should be low enough that it is raised slightly by the tractor when you back under it. This ensures contact.