Corroded Trunk Seams
Hahaha. Living in the Northwest, you'd think I would have been able to answer that.
I guess it makes sense. Along a flat seamless piece of metal, water cannot hide. But toss a seam into the works and water has found a home. I would have thought that white sealer crap would have helped prevent this. Perhaps it was porous? I have no doubts also that they slobbered that crap on there and didnt get completely covered.