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Question:

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

The rear trailer must be at the correct height to connect to the converter dolly. It should be somewhat lower than the center of the dolly's fifth wheel, so that when the dolly is pushed below it, the trailer is elevated slightly.