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Anchor posts in concrete, no need to footer wall. Use 8" or 10" sonotubes and go 36"+ with the concrete. If you're worried about it, you can just put in the concrete tubes and the use anchor bolts to tie the walls down to the top of the sonotubes.
I've installed far heavier buildings on sonotubes spaced every 4 feet. The soil in Midwest will be fine unless you are in a swampy area, then you have to go deeper or bring in fill.
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