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I think photos of what you fabricated might help, depends on how stout your tines are, if you built one that hangs off the dozer blade from the top, just think of the forces at work, what you built and how you will use it. If it's strong enough, 12" would appear to be fine, and it should work, but also does not mean you have to use it at full depth, but at least you have 6" more than you would if you set them at 6". Soil conditions, sound similar to sites I've ran root rakes with D8K's, after they were cleared grubbed and stumps removed, we hit the area with a root rake before sending in scrapers to take the top soil off. You have to be careful not to hit big rocks and large stumps with these, we had ones similar to the photo below. Here is a Fleco root rake, not that far from me, just too much money, would fit a 74" Gauge caterpillar tractor like a D6 9U and I thought my D7 as well, same gauge tractor. It mounts right on the C-frame, I sure wish I had one of these, nice to clean up after clearing.  Link loading="auto" style="width:auto;height:auto">
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