Brett,
This does work best with a lot of loose dirt. If there are some areas with grass, the loose dirt will just level it out. If they are small patches, the 6x6 will usually strip it off. When dragging, a lot of the debris, rocks and loose turf will build up in front of the 6x6. This makes it easy to stop periodically and get rid of it. I have put in close to an acre of lawn this way over the last 25 years at my place. Before I had my tractor I would drag it with either a car or my riding mower. As I said before, this is a very "lo-tech" solution, but it's worked fine for me over the years. BTW, I just put in about 6,000 square feet of lawn in some really bad soil (hard clay). I saw some quick start fertilizer at Home Depot and gave it a try. I have never had lawn come up as quickly as this. I had sprouts at 6 days and I was able to mow it in 3 weeks. I have to think that fertizer helped. Hope this answers your question Brett.
Greg