Ah Hi, This job calls for a professional, find a contractor that builds houses. Check with Home Advisor or Angie's List. Aloha!
You need a deep concrete pad on the bottom
I had a contractor come and he put cinder blocks and shems. Made a world of difference. It cost $250.
We used a floor jack and piece of wood on top when we put a heavy bakers rack in kitchen. It is still working 18 years later.
Check out this YouTube:
Try car jacks
Have 2 bottle jacks I thought I would use