With my cabover camper and boat in tow, I usually just used tow/haul if it was a very steep grade. Moving up to a 5th wheel was a question mark in my mind about using the feature. It sounds like you guys believe in it for bringing groceries home. Lol. Thanks for the replies, I'll use it more often and see how it goes. In my particular truck, I was under the impression that it locked it in 3rd gear, that made it sound like things were working harder when they didn't have too.