I cut a bunch of poly 55 gallon drums into thirds lengthwise and built a small rack to hold them from 2 X 4s, it worked great. I wanted to move it as far as I could and calculated the angle by dumping coal on one piece and got it to run at about 35*. Then when I used it, I wet the coal to keep the dust down (I had NO dust). Well the wet coal gets a little sticky on the poly and needed an assist now and again, I would go with a minimum of 40*. It was only the first truckload that I needed to get that far over, the others flowed like water after that as I tipped it to a higher angle.