Well, I know the 6.0 Ford has a deserved bad rap, but I think Ford got most of the kinks out. I looked at all the TSBs before I bought mine, and after 05, most of the drivetrain TSBs went away. That's what made me feel better about buying a Ford. I only have 2800 miles on mine, but I've been towing some pretty good grades in that time and haven't had a problem. I get 7 mpg towing lots of grades in a headwind, and 9.5 - 10 mpg on flats. That's with a 17k 5er and 4.30 gears going 65-70 mph. Also, I went with an auto. I would have purchased a Duramax/Allison, but you can only get 3.73s in the dually. I don't know why chevy did that, but that's really what it came down to. Good look on whatever you purchase.
2007 Jayco ReconZX
2008 Ford F350 CC DRW 6.4 5sp TorqueShift Tow Boss 26k#GCWR