The wood is fine. You could put 10 cars on those blocks you've made. As stated earlier the only other likely danger is a sideways load causing the blocks to tip, but that would probably take a substantial hit, like another car bumping into it. Of course if that were to happen you'd be screwed no matter what you did to the stands.
Less likely dangers include: Earthquake, flood, volcanos, tornados, hurricanes, plague, asteroid or meteor, alien abduction, and spontaneous human combustion.
Good luck!!
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