Perhaps wmtire will chime in here, but I think that the tire manufacturers say two things. First, don't let it stand long-term on anything with a petroleum content. This would include, for example, asphalt paving and creosoted or pressure-treated wood. The second thing, if you put it on boards or blocks, they must provide solid support under the entire width of the tread. Do not let the edge of the tread hang off the edge of the boards/blocks.
Bill
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