It would seem to me that if the truck has a corrosion issue, that it's due to faulty manufacturing and not something that is wear and tear. It makes me wonder what else is corroding in the vehicle that I cannot see. Of course, Chevy's HQ position is that it is not under warranty. This is turning out to be a bad investment on my part. The problem is across the whole GMC line. I try and buy American but this is what I get!