I brought home a new 2015 GMC 2500hd this weekend. SLT, pretty well loaded and GORGEOUS! I love this thing! Traded in a '13 GMC that was an excellent truck, just boring. I never fell in love with...
nice looking truck! I'm thinking that the bedsides are slightly taller on the '15 than the previous gen even if its the same platform. You may need to look at some adjustments on the suspension of your FW to bring it up a bit.