I've seen several of the 2009+ body style with rotted front fenders from the stuff glued on the inside and never knew the problem until I started reading about it on google. A friend of mines neighbor has that body style ram and has held up a lot better then same year gm and Fords.

I don't know why car companies insist on using the foam. I guess they don't care because when things rust out they can sell someone another vehicle. Sound deadening my ass, I'd rather put up with a bit more noise then rust.