I have a question for you guys with diesels puling your trailers. I have a 2005 f-350 4x4 with the 6.0 diesel. I am pulling a 8000 pound TT toy hauler empty(11,500 loaded and I have not pulled it loaded yet) My truck will not pull my trailer in overdrive which is making me get 5 mpg . So what I was wanting to know is how is every body else doing. What truck are you pulling with, how much weight are you pulling, and will it hold overdrive. Oh yeah whats your mpg while towing ??? Thanks in advance.