What is the purpose of the locking lever on a converter dolly's fifth wheel?

Pick an answer

1. It only controls the dolly's brake lights
2. It secures the jaws of the fifth wheel around the trailer's kingpin so the coupling can't release on its own
3. It adjusts the dolly's ride height for rough roads
4. It is a spare handle with no functional purpose during normal coupling or uncoupling of the dolly and serves no other purpose

Correct!

Not quite. The correct answer is highlighted.