Yup... plywood breaks! You are so right Ironraven. Get yourself to an RV store and pick up a jack pad. They usually sell them in packages of four but you can often find them one at a time too. They are designed to be used under the leveling jacks on those great big RVs. We've got an RV and the 2x2 plastic pads work great and will help prevent sinking into soft ground. They also have some other types of jack pads that have built in handles to place them where you want them. Go online and look up RV jack pads to get some more ideas (Camping World comes to mind).