What should you check regarding the trailer air lines (the 'gladhands') during a pre-trip coupling inspection?

Pick an answer

1. That they are left slightly loose for flexibility
2. That they are properly connected, not crossed, and the seals are not cracked or leaking
3. That they are left disconnected until the trailer actually starts moving down the road
4. Only that they are the same brand as the tractor's lines

Correct!

Not quite. The correct answer is highlighted.