The XPR10 book
https://www.bendpak.com/XPR-10-Series-Two-Post-Lift-Manual-5900951-BendPak.pdf
"Q: How thick does my Concrete have to be? A: 4.25 inches thick, 3,000 PSI, cured for a minimum of 28 days. Do not install the Lift on cracked or defective Concrete. Do not install on asphalt or any...