I am in the market for a good ground prep attachment for a skid-steer. I have a case 1840 and 1845. I would like to use the attachment on both. I am doing hydro-seeding and wish to be able to prep the ground. I have looked at pamphlets for the harley power rake and etc. No one in my area knows much about them. All they told me is that they could get one. Does anyone have experience with any brand? Any advice? Can I expect these machines to prep ground that allready has grass and weeds on it?