Here's the dolly rigged over the planting hole.
I pounded the hook into the ground with a sledge hammer and some wiggling.
I tied the guy line to the hook. The curved hook is a lot easier to get out than a straight stake. Wiggling it enlarges the whole hole so it pulls right out.
When we untied the tree it swung to the right and the dolly started to tip. So we blocked up one end of the 2x4 under the dolly frame.