We have used them on log carts that we park attachments for a small tractor on. This allows us to easily bring the attachment to the tractor and level it with a three-point hitch. All this in a building with a smooth concrete floor, except for the standard sawn expansion joints. We didn't have a 250 pound load on each of them, but we broke a few of them rolling over the sawn expansion joints. Falling apart on bearings.
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