When backing a tractor under a trailer, you should:

Always use the lowest reverse gear.. Section 6.4: Use the lowest reverse gear to move slowly and avoid damage.

When backing a tractor under a trailer, you should:

ANSWER BREAKDOWN
  • A. Correct. Use the lowest reverse gear to move slowly and avoid damage.
  • B. Incorrect. "Use the highest reverse gear." is not correct. Use the lowest reverse gear to move slowly and avoid damage.
  • C. Incorrect. "Not look in the mirrors." is not correct. Use the lowest reverse gear to move slowly and avoid damage.
  • D. Incorrect. "Approach at an angle." is not correct. Use the lowest reverse gear to move slowly and avoid damage.