We love our 2015 Chevy Duramax. It has not only tow/haul, but also a built in diesel exhaust brake at the push of a button. We have over 30000 miles this past year, including the Tetons & El Cajon pass & the Smokies with NO trouble. From the wife's perspective, I love the grab bar locations for entering & exiting the vehicle and the VERY comfortable seats. We bought the standard bed which some call short box and a Pull-Rite fifth wheel hitch. With the 3500, we have enough capacity for 15000gvwr on the fiver (although we don't use all of it). I forgot to mention how QUIET it is! Can you tell that we are happy with our purchase?