Update after removing the concrete slab we built a wooden deck instead. so foundation stays dry.
This is the jack i used
PITTSBURGH AUTOMOTIVE
4 ton Portable Hydraulic Equipment Kit Harbor freight # 60407
https://www.harborfreight.com/4-ton-p...
But if you can afford it I would buy a 10 ton
https://www.harborfreight.com/10-ton-...