How many with a lift?

[BMR Sales]

Since no one has answered, a four post lift can be used on any standard 4" thick concrete garage floor with no special requirements and most can be outfitted with caster wheels so they can be moved around easily. A two post lift will require dedicated concrete mounting pads that include anchor bolts in the floor to bolt it to. Once a two post is installed it cannot be moved. There are advantages and disadvantages to both designs.

I would say that you want Thicker than 4". To me 4" is sidewalk depth, not something you want your car or lift sitting on. I was stuck with what I had (Fourteen, yes 14" thick Slab), so I have anchor Bolts.

Yes Castor Kits are available, but I don't like them