Does anyone have a recommendation for a ballast based ground mount system that would mount one or more portrait 400-450W bifacial panels ( one high) that is inexpensive and can be daisy chained ( connected side by side) to accommodate about 32 panels or 4 strings of 8. I've seen the IntegraRack IR30 that looks promising. I have many many yards of 3/4 inch blue/gray drain rock left over from a septic system install that would make the ideal ballast plus base rock. For up to 24sqft they indicate a 120mph wind capability. This is sufficient for most panels in this range. I calculated the area of a typical 400W panel at 21sqft. The reason I am interested in the ballast version is I have to get rid of this very large pile of drain rock and have a small Kubota tractor to move it easily. I also hate concrete having used many many yards and a pump on my last system. These racks are about 46" wide so 32 in a row would be 85 feet long. Thoughts, options, alternatives and options appreciated!