Hydrolic jack blocks

I took 3/4 Marine Grade plywood, cut them in 12" squares. Glued and screwed 2 pieces together turned 90 degrees. Then I cut some stall pad 12" square and screwed it on one side. I drilled a hole in one corner and tied a nylon string in a loop. Use an old broom handle with a bent 16 penny nail in the end to push them under the jacks and then hook the loop to pull them out. A little heavy, but not too bad when you are only lifting a couple at a time and I keep each one in the basement door nearest it's jack so I don't carry them too far.

Never had them sink in the ground or break.