Which statement is correct about pintle hook hazard for New Jersey CDL doubles/triples operation?

1. Leave the dolly component loose until highway speed for item 42-1
2. Never unlock the pintle hook with the dolly still under the rear trailer because the tow bar may fly up
3. Use the dolly only as cargo securement for item 42-2
4. Ignore the dolly if lights work for item 42-3