The 6X6 blocks are a good idea. The shorter the front landing gear the better for movement or should I say lack of movement. I also use a Fast Jack kingpin tripod stabilizer. Another good idea is to put a little more pressure on the rear stabilizers after the unit has been sitting for a few hours. The pads, mine are on 1X6 boards, will tend to compact the soil and the tires will loose some pressure as they cool thus requiring some adjustment. That is enough to do the trick for me. Unless you jack the unit up on concrete blocks to get the wheels off the ground odds are you will never be house solid. Get it the best you can and then get used to it. Anyway you need it to rock a little bit so your friends no when NOT "to come a knockin".
-BC-