You supply air to the trailer tanks by
a) Pulling out the trailer air supply valve
b) Pushing in the trailer air supply valve
c) Connecting the service line glad hand
Answer: b) Pushing in the trailer air supply valve
a) Pulling out the trailer air supply valve
b) Pushing in the trailer air supply valve
c) Connecting the service line glad hand
Answer: b) Pushing in the trailer air supply valve
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