Why should you connect the air lines and electrical connector before backing fully under the trailer in some coupling sequences, or immediately after in others, but never skip the step?

Pick an answer

1. These connections only matter for the trailer's cargo, not its brakes or running lights
2. They can be connected at the destination instead of before driving
3. The trailer brakes and lights need these connections to function once coupled and moving
4. Air and electrical connections are optional if the trip is short

Correct!

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