All of the following are typical hazards in coupling or uncoupling a rig EXCEPT:

A. when trailer brakes are not functioning, the trailer can be pushed into an obstruction
B. when trailer wheels are not chocked, the trailer may roll or be pushed into an obstruction and be damaged
C. when the ground is not firm for uncoupling, the trailer can fall and be damaged
D. when the tractor is not secured, the suspension system can be damaged


Answer: D

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