Old thread, but for those searching. This seems to be a common issue with these trailers. I do not run mudflaps and have 35x12.5 mud tires on my truck that like to throw stuff into this area. Mine is also wavy, but the back of this area is hollow. You can push throughout the entire area and it is softer than the side walls. I had a mini freak out when it happened, but had a couple guys that work at a dealer service center. They showed me delam on a trailer at the shop and it was totally different. You could push in the center of it and would eventually hit a hard area vs the entire wall section flexing. Point is, run mudflaps and this likely will not happen. Either way you do not really want to beat the area up as there is not much there to take a beating (about half an inch thick I believe). I do not know why the dropped the diamond plate for them, it makes a lot more sense, especially for those that camp off the grid where the possibility of throwing rocks and sticks into that area.
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