While a very viable setup for leveling the rv on the tires I just don't think it would work as well under the auto-level jacks. Methinks it would tend to curl.
4"x6"x12" or 6"x8"x12" wood blocks work fine. X2 on keeping the travel as short as possible.
Go look at some horse mats. YOu will change your mind about curling.
In my opinion, nothing in life is cast in stone and experiments stimulate learning. If you cut them to fit the size of your landing gear footprint, no way they can curl. If one decides to give them a try, the test may be worth the money well spent. It's not like the $38 will break the bank. You could also try to attach them to something rugged if you need more bottom out support. I am going to try them on my RV as a test as well.
I made up a bunch of these cribbing pads from PT lumber. They're not going to warp or rot anytime soon. They can be laid flat in the bed of the truck and won't go flying out on the road. They were real handy when I installed the Ground Control jacks. After raising the rig on the OEM front jacks, I placed a stack of these under the drop frame and then raised the jacks to do the removal and install, setting the rig on the pads.
I made the same cribbing pads as John...in fact it was a prior post of his that inspired me to make mine. I did cut a thick piece of rubber from old semi mud flap and screwed to the top. These things are rock solid and won't fly out of truck bed.