wait wait wait you would feel safer under this hydraulic system in which they CAN (not saying they will) give out as opposed to jack stands where it's just relying on design and steel on steel contact? i'm sorry i've seen way tooo many hydraulics fail to be safe under them...this is why they tell you use jack stands not more jacks when working on cars. I've had my Z up on 4 heavy duty jack stands for over a year, taken them off and worked on car then put the car back on the stands again for more work and i feel way safer under there then i would any hydraulic based system. Even hydraulic ship lifts have safety locks in place in case the hydraulics fail