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You should check the height of the trailer before connecting a converter dolly to a second or third trailer. The trailer height is right if

A the trailer will be raised slightly when the converter dolly is backed under it.
Explaination
To connect the rear trailer to the converter dolly, the trailer must be at the right height. It should be slightly lower than the center of the dolly's fifth wheel so that the trailer will be raised slightly when the dolly is pushed underneath it.
B the center of the kingpin lines up with the locking jaws.
C the kingpin rests on the fifth wheel.