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After you lock the kingpin into the fifth wheel, you should check the connection by pulling

A the tractor ahead gently with the trailer brakes locked.
Explaination
After you've backed under the trailer and locked the kingpin into the fifth wheel, raise the landing gear slightly. Then with the trailer brakes still locked, gently pull the tractor forward to check that the trailer is locked onto the tractor.
B the tractor ahead sharply to release the trailer brakes.
C forward 50 feet, then turning right, and then left.