Guys, I have ONE option with the rear end. With the 14k lb GVWR package, you get the 4:10 rear end. It has a payload capacity of 6540 lbs and towing capacity of 31,300 lbs.
I need a heavy duty truck. I don't haul with it all the time, but I need it to do it when I hook up.
If that costs me some gas mileage, that's just the price I pay for needing a heavy duty truck.