The 65tow is for light towing I thought, and the difference between 65dd and 80dd is the hp. Maybe a little timing and shifting differences, but almost the same. I used the 120 tune on my truck I just recently sold, I got used to it and never wanted to use any other tune with it. I also seemed to get the best mileage with it.
My tune selection was:
stock
40 tow
65 tow
80 dd
120 hp(race? performance? not sure...)
no start.
I used the 40 tow to pull a 9k trailer, got decent mileage, decent meaning better than 10mpg's. I used the 65 to pull the trailer empty, the 80 was nice, but like I said, I really used the 120 the most.
I hope that helps your selection, oh and I had a MT so it didn't make much of a difference between tow and DD tunes, they were just hp levels. Good luck, oh and mine is for sale so I can save you some money. It is in the classifieds, make an offer. I am in Del Rio, Tx so shipping should be fairly cheap.
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