I built a dirt bike track out at my friends property. It worked but it took alot of time and the the dirt would just get muddy and hard to work with. Also the dirt would stick to the roller and the tractor. It made more problems than pros. You can call pool companies and they alwasy have dirt from digging in pools and they have no where to put it so you can ask them to have it ant hey will DROP IT OFF IN FRONT OF YOUR HOUSE NO PROBLEM! well thats how it is here in california.