I mentioned a "farm jack"
here back in 2007.
Since then, I've actually enjoyed the farm jack s-o-o-o much, now I own three of 'em!
In 2007, I used one to simultaneously
lift the dock and
push the piling back under a supporting 6X8 cross member. (Winter ice floes caused
three pilings to slip off their supports).
With a 3˝-ton capacity—and at $49 from
Harbor Freight—you can still have it handy when you need to move anything-else that's
big.