How much space should be between the upper and lower fifth wheel after coupling?

None.. Section 6.4: No daylight.

How much space should be between the upper and lower fifth wheel after coupling?

ANSWER BREAKDOWN
  • A. Correct. No daylight.
  • B. Incorrect. "1/2 inch." is not correct. No daylight.
  • C. Incorrect. "1 inch." is not correct. No daylight.
  • D. Incorrect. "2 inches." is not correct. No daylight.