Made my first towing voyage with the truck this weekend. Took it almost 500 miles with a U-Haul trailer to get a 69 Cuda for my old man...pulling just about 5000lbs exactly. I'm not a big fan of the surge brakes on the U-Haul, and I couldn't use a weight-distributing hitch because of them, so it squatted pretty good. It towed well though, no sway or funky handling...brakes were ok. Had to hit 4th gear up some hills but I never had to go WOT...the power was there. Mileage was worse than I expected (13 out, 11 back) but better than the 8.1 2500HD I picked up my truck with a few years ago that got 8 loaded & unloaded. I found as I was driving that not using cruise control and kicking it down a gear kept it out of PE on hills. So I think mileage will be better my next trip.

All in all, I was happy with it. And I think it will be better with the weight-distributing hitch and electric trailer brakes.