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Question
When uncoupling a trailer, landing gear should be:
Answers
A.  Raised completely.
B.  Lowered halfway.
C.  Just off the pavement.
D.  Firmly on the ground.
Explanation
Landing gear, or trailer supports, should always be completely raised before a vehicle is driven. When uncoupling, landing gear should be lowered to make firm contact with the ground. If a trailer is loaded when it is being uncoupled, you should lower the landing gear and turn the crank a few additional times to remove some weight from the trailer.

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