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I use 6x6x12 pressure treated with a handle attached to the side for ease of carring and placing under the RV. These do seem to work well for spreading the load. But I have not tried them on soft asphalt. I do believe if I was just overnighting at some place like Wall Mart I would park on the most level area that I could with all the other factors considered and not use jacks at all. My Rv weighs in at 23K. But even just the weight from the tires can make impressions in asphalt. My parents Rv weighs in at about 28K and have made indentations on my driveway with the load spread out with 3x18x24 pressed beams under the rear wheels where my doesn't.
Just goes to show if its heavy enough and the surface is not strong enough there will be some damage. Best we can do is try to be prepared and think before you park.
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