When inspecting a doubles/triples combination, what should you check at each connection point?

Pick an answer

1. Only the rearmost trailer needs inspection
2. Safety chains are optional on converter dollies
3. That the coupling devices, safety chains or cables, and air/electrical lines are secure at every trailer and dolly connection
4. Only the connection at the tractor needs to be checked, since the rest of the combination is assumed to be secure once that one is confirmed

Correct!

Not quite. The correct answer is highlighted.