Hi personally have never used a preporator, but I’ve had a Harley rake on a skid steer for the last 18 years or so, I would think it would do everything you need, not only does it kick the rocks out but it does a great jobof loosening the soil as well as cutting highs and filling low spots as well. I usually hit the area from a couple of different directions to get it leveled up, then on a final pass I’ll run it forward, place the rake over the pile of soil and stones, put it in float and back up running the rake in the opposite direction, this leaves a great fluffed up soil and only leaves the tire marks from the rake. I’m pretty sure the member KSSS runs a preperator and is very happy with it, hopefully he will chime in.