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No argument from me... EDIT: FWIW, I've never personally witnessed any business pouring concrete using 2x4s unless they were stacked up...and if I did, they wouldn't pour for me

It's not only the thickness, but the composition and where the rebar or reinforcement is. Seek out the requirements as set forth in your lift. Most of the ones I've seen require minimum 4" 3K psi concrete...that's what mine is, and I've had no issues. Overtorquing the anchors, poor...