No camper dealers in my area so looked on the internet for jack pads. There is a lot of them out there each one a little thicker or thinner, and a little difference in shape. What do you use?
I've only had to use the pads, http://www.campingworld.com/shopping/item/oversize-jack-pads-set-of-2/56864 three or four times over the years. Found out back when I had a 37 ft Tiffin with the 8.1L engine, they would bow and sink in at least an inch on very wet RV park spots. I have somewhat fixed that problem, I bought a couple of extras while they were on sale and I double up on the ones on the front levelers.