Towing performance report
We just got back from our trip to Flagstaff, and thought I'd post the a response regarding how my 2000 F250 handled towing our trailer up the hills.
I had zero issues towing the trailer (28' travel trailer, 6200 lbs GVWR). I turned overdrive off for the entire trip. During the first half of the drive, including the long uphill about halfway to Flagstaff, I kept the speed at about 60 MPH. At that speed, it handled all but the steepest sections in Drive, with cruise control on. When it downshifted to 2nd, I manually shifted to keep it from bouncing back and forth. No problem at any point maintaining 55-60 MPH in second gear (running between 3300 and 4000 rpm.
After stopping at Camp Verde, I decided to increase my speed slightly, setting the cruise control at just under 65. At that speed, it climbed most hills easily in Drive (cruise control off). During a couple of steeper sections, it wanted to downshift, so I manually dropped into second, and kept the speed between 55 and 60. No problems all the way to Flagstaff.
During the entire trip I kept an eye on the temperature gauge - it never budged, regardless of speed or gear. Fuel economy while towing wasn't great - I expected that - I got just under 8 MPG towing up hill, close to 11 coming back down the mountain. That's a lot better than the 5-6 MPG I got from our motorhome.
Downhills were no problem – I never touched the brake, and got enough engine braking to maintain control.
The Husky Centerline WD hitch worked well - no issues whatsoever. No significant sway problems even when passing trucks.
All in all, I'm very happy with the performance of my truck/trailer combo.