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Could it hold it ?.....yes, depending on the stability of the rock beneath it and the thickness of the sub floor, 3/4" might need to be upgraded to 1 1/4".
I'd put down a foot of rock and set it in (wacka pack it) before setting the skids.
If your going to park a 3000 pound tractor in there you might want to rethink but joining 4x4's @ 3000 lbs this will put a lot of stress on the joint.
If it were me I'd try to work out where the weight will be the most (tire lines) and I'd be making sure that I had bearers right under this area
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