I see where some 4 post lifts are on casters. Sounds like a keen idea, however my Worth Lift is bolted down.

My Brother and I each have a bendpak lift. I have a two car and he has a one car. Very well built but we hate the air lock system. I went to a champion last fall for the manual releases. Don't have to run air to the lift and I am much more confident they are releasing. As mentioned already though being careful and watching what you are doing would probably stopped this accident from happening.

My dad and I have two advantage 4 posts with manual safety stops. The notches for those stops are laser cut into the 4x4 post. After seeing the titan lifts and the way the stop notches are cut into flat stock steel relying on a bolt at the top to stretch it tight, I would never own one. The titan guys were having to use every bit of their impact guns on Friday this year during judging to resolve issues getting the stopping plates pulled tight enough that the stops would catch. At one point, one car was being lifted or lowered, and only one side was moving and everyone started shouting. Catastrophe was avoided but I wouldn’t own a titan lift after seeing that. We’re very happy with our advantage lifts. Extremely heavy duty. Not cheap, but worth the money in my opinion.

After what I saw with the Titan lifts at MCACN, I was thankful no people were hurt and no cars were damaged.

I'm actually buying another 4 post and it is another Advantage. Been happy with my other one, very robust and never any issue. I don't bolt them to the floor either. No air controls for me, I'll stick to the mechanical operation.