Buying a Former Rental Class C. How many of us out there?

I find that tow/haul does a better job of maintaining speed on steep downgrades. Seems to hunt for gears less and, like you said, downshift sooner on upgrades. On flat ground, I don't use it. However, I plan to tow my minivan this summer, so will experiment with which works best with 4500 pounds hanging on the back of my MH.