In Minnesota if it is attached to the loader you must have the loader secured properly, and any articulating attachments (the backhoe arm) must be secured by a separate chain of suitable capacity to prevent movement while in transport. Extend the boom/stick enough to rest the bucket firmly on the deck.
If it is just the backhoe attachment, I would extend the boom and stick to lower the center of gravity and secure it with 3 - 4 chains.