Long time reader, first time poster - so take it easy on the new old guy. 😊 We just bought our 5th wheel (2012 Bighorn) and am now looking for my truck. It may be overkill, but I have decided to buy a 3500 dually (GVW of 5th wheel is 14,000). I have never owned a diesel truck and am looking for recommendations as to which rear end to get. I was thinking 3.73, but found a good deal on a new one with a 4.10. How bad will this hurt me on mileage when just driving the truck around town? How about when towing? I know there will be differing opinions, but that's OK. We're hitting the road in mid June and I am just trying to get my ducks all in a row. Thanks in advance for your help.