T Bar can you place those overhead cranes on just a normal 4" slab or do you need thicker more rebar type footings,
the 2 post lifts do they require engineered footings or can they be mounted on a 4"slab, would a 9k lift be adequate for a 3/4 ton ford super duty
No you cant, you need thicker and more rebar type footings. I put 3'x3'x12" in mine. On the lift that 9k is pushing it a lot. I go with a 10k or 12k on a 6" slab. I like the drive on four post with the trolly lifts that work in the center of the ramps.
Look at Greg Smith Equipment Sales they have a site on ebay.