The iron trailer supports that you crank up and down are called:

The landing gear.. Section 6.4: Landing gear supports the front of the trailer when it is not coupled.

The iron trailer supports that you crank up and down are called:

ANSWER BREAKDOWN
  • A. Incorrect. "The dolly." is not correct. Landing gear supports the front of the trailer when it is not coupled.
  • B. Correct. Landing gear supports the front of the trailer when it is not coupled.
  • C. Incorrect. "The kingpin." is not correct. Landing gear supports the front of the trailer when it is not coupled.
  • D. Incorrect. "The shank." is not correct. Landing gear supports the front of the trailer when it is not coupled.