My yard has crop row ridges running laterally across it. They are about 4-6" high spaced about 2-3' apart. There is about 6-10" of topsoil over lots of large rock. I want to level it out to make mowing and just walking easier. I have a garden tractor with box blade/scraper and a JohnnyBucket Jr scoop in front. Is there a better approach than just tilling and blading?