I don't use wood. Wood is heavy, supports rot, mold and mildew, absorbs water, dirt, etc. But it does make great camp fires.
I have a set of large plastic pads - I think they are over 12 inches wide. I also have 2 sets of Lynx pads. The idea is to spread the load over a wide area and also to not extend my landing gear or auto-levelers very much - Seems to make things more stable. When I pick up the pads I smack them against a tire and any dirt just shakes off. And they are lighter and take up less room then wood.