Since I've had to put 4" of pink foam in the pickup bed to accommodate the higher cab on my Ford, I'm nearing the maximum travel on my jacks. An inch or two would really help. What to you use, if any...
Or some 12" square peices of micro lam Find a building site where they are using some and ask 'em for some scraps. Or make your own from several layers 3/4" plywood