DIY Lawn Drag to Level the Lawn

I put together an idea of a leveling drag to use on both my seeding bed in the front yard as well as for ongoing top dressing for smoothing out and leveling the lawn. This in total cost about $50 for the materials and at most an hour of my time.
Part List:
Five 8 foot 2x4
One 8 foot 4x4
About a foot of 2x2 to screw hooks into
Two 130 pound rated i-hooks
Two carabiners
15 feet of chain