Final answer:
The converter dolly should be uncoupled from the rear trailer before unlocking the pintle hook to avoid potential injuries and damages. option 1 is correct
Step-by-step explanation:
option 1 is correct uncoupling the converter dolly, you should never unlock the pintle hook with the dolly under the rear trailer for safety reasons. If you were to unlock the pintle hook when the dolly is still attached to the rear trailer:
- The dolly tow bar could fly up, possibly causing injury.
- The trailer could drop, potentially damaging the dolly and the rear trailer.
- The trailer could start to roll, posing a serious hazard.
Therefore, it is important to raise the dolly and ensure it is clear of the rear trailer before unlocking the pintle hook.
When uncoupling the converter dolly from a double or triple trailer combination, it is imperative to never unlock the pintle hook with the dolly positioned under the rear trailer. The primary reason for this precaution is the potential hazard posed by the dolly tow bar. If the pintle hook is unlocked while the dolly is under the trailer, the tow bar could suddenly and forcefully fly upwards when tension is released. This poses a significant risk of injury to anyone nearby. Additionally, if not appropriately secured, the action of the dolly tow bar can cause instability and unintended movement of the trailer or dolly.