I was looking for rather heavy duty LR for foodplot clearing where we encounter fair # of rocks in the 6-8 inch range. Thought the heavy duty models might handle that stuff best. When cross-checking the specs for various LR makers, seems that they all employ 5/16" by 1" tines. If that's the case, I'm not sure the heavier LR's would handle those rocks without risk of damage any better than the regular duty LR's. Anyone know of heavier tine model out there that might be better suited to that material??