I've used 6x6 blocks under my stabilizers since I first got my PUP last year (upgraded this year). And, I don't have any bolting system. The weight of the TM keep the block and the stabilizer together. I haven't seen any problems with it, even with the lighter PUP. My blocks are pressure treated lumbar as well.
As far as the settling, since the blocks have a surface area of 6x12 inches, they don't tend to settle as much in softer ground. I haven't had any troubles on gravel, or the grass next to my barn - where the TM is parked until my next trip.
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