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Question:

Before you can supply air to the air tanks of a second trailer you need to:

A Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.
Explaination

Open shut-off valves at rear of first trailer (and on dolly, if so equipped). Close converter dolly air tank petcock and shut-off valves at rear of second trailer.