When coupling a trailer, in what order should you generally connect the air lines?

Pick an answer

1. Connect only the service line, since the emergency line is optional equipment on most modern trailers built today
2. Connect the electrical cable before either air line, every time
3. Order does not matter as long as both lines end up connected
4. Connect the emergency (supply) line, then the service line, keeping lines from crossing or twisting

Correct!

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