Regarding high strength concrete -- the usual concrete is 2000psi and high strength is 3000psi and requires a deputy inspector to watch the pour and make the lab test to affirm. This is a designed concrete and is specified by a structural engineer in a construction project (California). Since I just bought a slightly used lift today from a garage going out of business I will need to research what is needed. I suspect a concrete pier Think a cube that is about two feet deep and 2 times the size of the base. 2000psi concrete will be strong enough. Sherwood Kahlenberg