I agree with you in regard to the sun, but my coach is garaged-and there aren't any windows for the sun to beat down on it. The corrosion is not rusty steel, but aluminum corrosion. My guess is that it's due to contact between dissimilar metals, ie: steel framing and aluminum skins in full contact. The only place that the corrosion exists is the aluminum covering wrap at the extreme back end of the coach. Showhauler ends the framing with what appears to be a piece of 3" x 3" steel square tube and then it's covered with aluminum. Other steel to aluminum has the tape in between the two metals. Add any stray electricity to the mix and you have a battery. Anyway, this is just an educated guess and the question was, is anyone else having this experience or am I the only lucky one?
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