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...
I think the ride hight difference is not going to be a problem. Just towed 200 miles and it pulls great, as you would expect! Much more quite and comfortable than the '13. Just love these mirrors.