In order to make things run smoothly, you will have to prepare your boat before the maneuver. For a simple trip out of the water, these preparations will be succinct, but for a road transport, you will have to take care of the following points:

When releasing the boat, suspend the maneuver for a moment as soon as the boat touches the water but the straps are still under tension. Raise the hatches and listen for any "gurgling" sounds. It is indeed easier to ask the crane operator to raise the boat as long as it is balanced, than to call him back a few hours after he has left...