I am looking to lay a pad for two vehicle lifts. A 2 post & a 4 post. Minimum size 7m by 7m & poss up to 7m x 10m. I have only ever done small areas before. A few questions. Would you use rebar? How thick? 4" meets the spec for the lifts. Would you change how thick if you do / dont use rebar? Is one slab better/ easier or would you fit each lift on its own slab? How deep for the compacted base? I am not sold on strands for strength but for small cracks they seem to have a place. Would you agree? If I have to span a 40mm stone filled in french drain would that be an issue? Any tips?