I received my new Extang cover yesterday. When I tried to install it I found the front rail to be 4 inches longer than the rear rail by the tailgate. I called Summit since I bought it through them and at that time Extang was already closed for the weekend. The tech support guy from Summit tells me that the front rail IS longer for the new full size GM trucks because the bed is tapered to the rear. I noticed the bows are all different sizes too. I measured the bed and yes its wider in the front but no way a full 4 inches. Im thinking Extang put the wrong parts in the box. Anyone else have a Platinum Classic on their truck ?? I already dropped the cover off at UPS to send back. Im hoping Extang goofed and this isnt the way this cover fits.