I also have a roll over box blade, back blade & grading scraper. Without a doubt the grading scraper( Land Pride GS2584) works the very best on my mile long gravel driveway. I tried for a little over thirty years to maintain the drive with just the back blade. It worked in certain instances but not all the time and not down the entire driveway. The GS(purchased 2012) does it all the time and throughout the entire drive. The back blade now handles the winter snow removal.