Which statement is true about coupling the dolly to the trailer during doubles/triples?

Answer: B — The pintle-eye alignment must be correct

When coupling the dolly to a trailer in doubles or triples, pintle-eye alignment is essential for a secure connection. If the dolly’s pintle hook isn’t lined up with the trailer’s eye, the hook can’t seat properly, the latch may not engage fully, and the connection can bind or loosen as you back or turn. Proper alignment makes sure the hitch slides straight into place so the lock can engage cleanly, keeping the dolly and trailer joined together under braking and steering forces. Once the pintle and eye are aligned and locked, you can safely proceed to connect other essential safety features and lines. Air lines should be connected correctly—not swapped—to ensure the trailer’s braking and suspension systems function as intended. Safety chains are not optional; they must be in place from the dolly to the trailer. And the trailer brakes should remain connected through the vehicle’s air system, not disconnected.