On one of his photos, it looks like there was a bulge right above the pile of shavings. That led me to believe it was termites, but I'd think you'd see some wood dust as well. There is, after all, a layer of think plywood atop the styrofoam. But I didn't want to scare him. I put my money on bugs, especially after 4 years.
2012 Rockwood 8293RKSS
2006 Dodge Ram 2500 5.9L Cummins Turbodiesel 4x4; 2012 Ford Escape 4x4. 3 very pampered cats.
Days camped: 2011: 61; 2012: 66 Days; 2013: 69;2014: 68 2015: 90 Days camped 2016: 34