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Should the shut-off valves on rear of last trailer be open or closed?

The shut-off valves on the rear of the last trailer should be closed. This is because the shut-off valves are used to isolate the air tanks on the trailer from the air tanks on the tractor. When the shut-off valves are closed, the air tanks on the trailer will not be able to receive air from the tractor. This is important because if the air tanks on the trailer are not isolated, they could fill with air and cause the brakes on the trailer to lock up.
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