[JRTJH]

Putting blocks under the jacks (as pads) won't improve stability over using 2x10's or ???? Putting blocks under the frame to support the entire RV will significantly improve stability and essentially stop all movement inside the RV. This isn't practical with a "mobile" RV, but if you're going to be in one place for the duration, blocking the frame (similar to a mobile home) will give you a much more stable RV. Once you block it high enough to take all of the suspension/tire movement out of the unit, you'll notice a remarkable difference in stability.