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well, my front loader puts quite a bit of weight out front.
I'll have to measure this disk, I don't think its 6-7' wide, more like 5' or so, its got 6 20" disks on each of the two axles, which are at a bout a 45 degree angle to each other, and the disks are dished the other way on the one.
aw heck, a picture is worth 1000 words. click on them for bigger pix...
my dog approves!
a few more pix here