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When coupling a trailer:
A.  Make sure to couple matching glad hands.
B.  Any glad hand can be connected to any other glad hand.
C.  It is best to leave one glad hand unattached.
D.  Only one set of glad hands should be connected.
When coupling, make sure you couple matching glad hands. They are often color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.
Answer Statistics
8.49 % of our users get this question wrong.
This question's difficulty is Medium

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