I have a new motorhome , 2014 Adventurer 37F with the F53 362-hp 6.8l V10 Triton engine, TorqShift 5-speed automatic overdrive transmission with tow/haul. Mileage is about 6000 miles. This is my se...
Leave it in tow/haul but when the rpm gets up to about 4500 step hard on the brakes to slow down 10 to 15 mph then release your foot on the brake. Repeat the process when it gets up high again. Let the engine do the work. You will need some assisted braking but do not ride the brakes.