Just another quick update.
Just got through pulling through the Berkshires, Catskills and over Routes 6 and 59 in PA.
Very satisfied with the way the rig handled the steep ups and downs. one posted elevation was about 2500 ft.
Truck had no problem up the steep inclines. Tack was in the 2000 to 2500 range most of the time. Did hit 3000 and 3500 once. Truck did not sound like it was going to explode. Towed mainly in M5 with tow haul.
the grade braking feature was fantastic. Always felt that I was in control and did not have to worry about the brakes overheating and losing some braking power.
Surprised how easily the truck kept my speed fairly constant in cruise control. No real problems keeping the speed limit except for one place where I was down to 40 mph. I could have boosted the speed but I didn't horse the truck.
IMO, I am very pleased with the 1500 towing compared with the 06 2500 4 speed that I had. The 6 speed tranny seems to make a world of difference along with the new computer technology.
Main difference I find is that the 2500 was a lot stiffer and stronger truck but it really didn't feel any different towing the Heartland than with the 1500. The trailer seems light on both vehicles. Perhaps the wider spacing between axles is the reason. The Jayco seemed heavier when towed by the 2500, never towed it with the 1500.
In summary, I am pleased overall with the truck and the setup. Averaging 10 mpg when towing,
Performance is much more than I had hoped for and any apprehensions that I had in the past are now gone. However, with the weights and setup, this is as much as I would want to tow with the 1500.
Again. thanks for all of the advice.