I was looking at some 2001 3500 duallys in all white and all black and I noticed that on the drivers side right behind the fender where the body curves( 2 curves) the paint is so thin that you can see the primer. I think that the fenders are put on then painted. I've seen this on three black and white trucks. All made here. This only appears on the drivers side. Please check your trucks for this. I have not yet seen this on metalic or pearl colors. Joe