Best leveling pads under jacks of 18k lb. class A?

I used a 4x8 sheet of 3/4" pressure treated plywood, cut into 16" squares (no waste) and tripled them and screwed em together.
The DP (33,000 pounds on 3 jacks) tacos them a little, the gasser (26k on 4 jacks) didn't even dent them.

Drill holes in the corners so you can use an awning stick to move em