We use 2-6x6x24" for rearward most legs and I cut up a 2x10 into 16" lengths and screwed 2 together for a total of 8 "pads" if you will. These get placed under the remaining legs. There have been at time when only 1 "pad" was put under the leg due to close proximity of left to ground to begin with. As others have said, the less extension of the cylinder, the less movement in 5er. Likewise, a couple of times, 1 set of wheel have been lifted off the ground, but the coach doesn't go anywheres.
I have used the boards (pads) a couple of times under the legs to lift tires off the ground for various reasons. Not for very long tho. IF I have to remove both wheels on same side, I then add weight appropriate jack stands under the frame in front and rear of tires. Course this is when I'm home. Should this be necessary on the road, think I'll call road service.
