When securing heavy machinery (such as an excavator or bulldozer) on a lowboy trailer, what must be done with the machine attachments?

1. Lower the bucket, blade, and boom to the trailer deck, engage mechanical locking pins, and secure each corner with rated transport binder chains
2. Leave the excavator bucket raised high in the air for visibility
3. Rely solely on the machine's parking brake without using transport chains
4. Tie the tracks down with plastic nylon rope