I just built a 30x40 and am planning a 2 post lift, although not likely a BendPak. Almost every lift manufacturer recommends 4.25" / 3,000 psi, but BendPak is the only one I looked at that recommended rebar (the other outlier was Apluslift who said 6" / 3,500 psi). Since I wasn't going BendPak...