I have a 2007 DC, 5.7 Yesterday, as i was washing the truck, I noticed a small amount of discoloration and RUST on the edges of the rear bumper, where it wraps around the bedsides. I only have 28,000 miles on the truck. Check your bumpers and let me Know if anyone else finds this problem. I will go to the dealership on 10 nov 2008 to see how they plan to take care of this. I will let everyone know what they say.