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Over the years, I have found a way to do a backyard test of hardness of concrete. Might just help in your search. Get some masonry nails and try to drive them. Use a 2-pound hammer and if they drive reasonably well you've got 4.5 or 5 bag mix. If they are difficult or next to impossible you've...

The thickness and quality of the concrete floor is important. With a floor, 4 inches or more made with 6 bag concrete and a good gravel base, I'd go with a two post. You get more floor space under it. It's wise to consider that you might want to put a wider vehicle up in the future.