What do you put under your stabilizers and trailer tongue?

I carry 2 pieces of 6x6 and a 2x6 for the tongue if needed. I don't like to extend the jack any higher than necessary for the wobble factor. The stabilizers sit on the yellow lego blocks which sit on 12x12x1/2 marine plywood scraps. I use the plywood if on gravel or ground the legos will sink in.