i have allways ran dodges. 03 and a 06 both with the 5.9 and autos.. the motors were GREAT,, the 48re trans, not so great.the last one was a 06 dodge mega cab 4x4 it ran great got 21mph and 17 pulling my 32' trailer. but it seemed like the rest of the truck was having trouble, A/c trouble, a little trans trouble, and the integrated control module, but we still loved the dodge. and now we are trying a 08 ford F-550 with the 6.4 it only gets 11.9 empty or loaded, but man does it pull..but we are fixing to do a DPF deleat and a EGR block off, and that should help the mileage, it is a 4 door and kinda loaded, it has 125k miles and we gave right at 20500.00 with no bed, but putting a f350 dually bed for it right now..