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
Originally, I wasn't going to park the tractor in there, but after hearing it's "O"verkill, I'm now thinking of adding another skid and doubling up the plywood floor so I can use it, if need be.
My CFO, would love to see the new Kioti get parked under roof. Me, I's just store it outside under a tarp, but she's really into keeping anything out of the weather, if at all possible.
Do you plan to eventually move this building? If not, go with 2x6 on 24" center instead of the 4x4's with the larger spacing. As for the decking, screw the first layer down with screws spaced every 6" then lay a second layer 90* to it and screw it down similarly. Will be solid as a rock (Concrete as mentioned!) and will be great to park that tractor in.
I guess maybe my closing 'line' could be...."Too much overkill is not enough".
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