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Question
Before coupling, you can secure a second trailer by:
Answers
A.  Depleting its air tanks.
B.  Leaning it against a wall.
C.  Removing its emergency line.
D.  Setting wheel chocks.
Explanation
If you are attaching a second trailer to a combination but you have doubts about the trailer's brakes, you should use wheel chocks to secure the trailer in place while coupling.

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