Turns out that I was wrong about the melted/burned rubber and foam being caused by the exhaust going over the axle, it appears the vehicle was operated without a tailpipe for some distance, and the muffler was dumping directly into the front floor pan. I got suspicious when I noted the closest passing of the muffler to floor had no heat damage above it and was over a foot from the burned spot. I already knew the tailpipe behind the muffler had been replaced, and when I looked at the heat damage it was exactly where the exhaust gasses would have hit the body if the tailpipe section was removed from the muffler section.
I only had enough time last night to get the peel and stick sound deadening installed in the cargo area, having to contour it to the corrugated floor and roll the surface down took far more time than expected. It still needs insulated, then the cargo area interior can go back in.
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