[QUOTE=Mountndream;850025]before you laugh, we bought the truck we will need not the one we need now. We are towing a 2014/15 Microlite 2109s with our 6.4 Trademan CrewCab 4x4 with 3.73. We have made 2 small trips and haven't really tracked our mileage that well. We have a big trip to RMNP from St Louis in a month and we will be tracking it then.
Impressions, well, its a big truck and doesn't know our trailer is back there. Love the integrated Brake control (and Sway control supposedly). I have plenty of power if I need it. It will pass anything but a gas station. If the 4.10 rear end would make a difference in the Gas mileage, it might be worthwhile
If you are buying one get the back up camera. Its easier to back in with the camera than to pull into spaces.
Going from 3.73's to 4.10's will improving towing somewhat, but mileage will decrease. If you want Mileage the Cummins is the way to go, or if you are pulling anything big. Pulling these big 5th wheels with even the 6.4 Cummins is okay for short trips or if you do not encounter many long climbs, but there is a big difference between climbing a 6% Grade for 5 Miles with a 800 Ft Lb Cummins and any Gasser. The Hemi is awesome, Had a 5.7 in my 2011 1500 Crew Cab and hauled lots of Horses to Horse shows in it, but there is a big difference and you do not not need the lower Gear Ratios to get the job done effortlessly. My 2011 Ram 2500 HO Cummins did it well with 3.73's but my 2014 pulls the same 42ft 356QBQ with 3.42's and gets better mileage doing it.