When coupling a converter dolly to a second trailer, the dolly air tank should be:
a.Full of air with the drain valve open
b.Charged with air and the drain valve closed
c.Completely empty of air
d.At half pressure
Explanation
The converter dolly air tank should be properly charged with air and the drain valve must be closed to maintain air pressure. This ensures the dolly brakes function correctly when the combination is in motion.