Tow / Haul button

When empty, it also works well when stuck in traffic. It will leave the torque converter engaged longer so you can drive by skinny pedal instead of having to use the brake often.

You may find when towing heavy on flats or into the wind, the transmission will not shift into the final gear. I will disable tow/haul to see if I can get into the top gear and whether it will hold it. If it doesn't or the transmission hunts, tow/haul will get enabled again and I continue on.