That seems pretty iffy considering they spec a 4.24" min thickness. My MaxJack has a 7K lift capacity. And my Cayenne Turbo is a beefy 5K lbs. I'd rather take my time and over engineer it to have complete piece of mind.
I took it for granted that my garage slab was thick enough. It wasn't till the unit arrived that I looked at my plans and it's only 3.5' thick. I'll be pouring 36x36x12 new footings, tying into the existing slab with rebar. I want to center the lift in the garage, but the new footings will run...