:Boh, I just happen to have a 2013 Ram 3500HD, crew cab, long bed, 4X4 Dually with the Aisin tranny and 4:10 gearing.....and love it...DEF is really no big deal...empty, I've gotten 1190 miles to the gallon up to 1350 miles per gallon, tank holds 5.5 gallons....have towed once with this beast and it's, to say the least, phenomenal...The EB is a two stage brake, gives you a couple of choices and the new 8.4" Nav screen is really easy to work with and use. More information at your finger tip than one could need and you can program up to 6 different screens to look at in the middle of your dash (EVIC). The inside fit and finish is top of the line with the Laramie and the Longhorn, (I have the Longhorn)...The truck is my daily driver and we make up reasons just to drive around in it....great looking truck, inside and out.