you uptown fancy guys with all your concrete. Sheesh. Out here in BFE all we have is dirt held down with years of oil spills. Since we dont have a fancy concrete base to work with, we replaced all of our roll around stuff (pickers, tool boxes, etc) with bigger wheels. That way they roll easy over dead snakes, bugs, rocks, dirt, shoes, feet, cig butts, empty .45 shells, and used condoms.
Maybe you could save some buks on all this fancy floor work (heck, we DREAM about working on concrete where I live) and just go BIG on the tires on your stuff. Harbor freight has replacements cheap that work fine.
Not throwing darts, just saying all that talk about cracks can be solved another way.