My work truck is a 2015 3500 dually with a 6.4 hemi. I'm not much of a gasser person, I feel im kind of spoiled by my truck and all ive done it it, but thats besides the point. Im not that impressed with the truck. Unloaded there is constant shifting, and super poor gas mileage. It gets about 8-10 unloaded. Hauled a 20' flat bed trailer the other day loaded with maybe 2 thousand pounds on it. The constant shifting was even worse, and got about 7 mpg. I couldnt imagine putting some real weight behind it. Dont get me wrong, theres lots of power, but you had better be okay with cruising at at least 3500 rpms