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During the coupling process, what is the immediate danger if the trailer is too high when the driver backs the tractor under it?

The air lines will not reach the trailer connections. The tractor's suspension will be over-stressed. The kingpin may travel over the top of the fifth wheel, resulting in a 'high hook'. The landing gear may be damaged by the tractor's frame.

Correct Answer:

The kingpin may travel over the top of the fifth wheel, resulting in a 'high hook'.

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