Before reversing under a semi-trailer to couple Brian should adjust the height of the tractor unit to suit. Which of these would *NOT* be a consequence of the unit being set too low?

Explanation: The following are all things that COULD happen and are therefore incorrect answers to this question:
• It would miss the trailer pin and possibly damage the tractor unit.
• It would cause damage to the trailer headboard.
• It could damage the air coupling valve on the trailer.
This answer is correct because it is not a possible consequence of failing to adjust the tractor height:
• It could cause a puncture on the 5th wheel: No, the 5th wheel is a metal plate and it does not have a tyre that could be punctured.

Category: CPC Case Studies: Vehicle Loading Unloading and Security