towing w/ work truck this weekend-need advice

jbres wrote:
Since I still have not found a used truck to buy yet, I am using a work truck to pull my 27' travel trailer 4 hours away to Lake Cumberland this weekend. It weighs loaded 6,700 pounds. Last time I pulled with this specific truck I was a little confused which gear I should be pulling it in, so I figured I would ask some of you who prob pull with same truck. Its a 2012 Chev 2500HD 6.0 3.73 rear end. I know I should prob have it in the "tow/haul mode", but should I have the shifter in the "D" for drive position where is doesn't like to pull above 55 or should I put in the the "m" manual positon and hit the "+" button to shift it up to 5 or 6 gear. 99% of my trip will be at highway speeds.
Thanks!
Also, I like to pull between 60 to 65mph.

I have the same exact truck and my trailer weights about the same. I use the tow haul mode and have never found it necessary to downshift. If you feel the need to downshift put in the M mode and go down 1 gear. Usually that would 4th or 3rd in the mountains. Try that and see what happens. Also I bought the work truck because it is the best value. I paid roughly 28k for as new 2500hd. Its the best deal around.