I don't tow anything heavy and unless you do there's no realistic way of putting the motor under a sustained load. I floor it up steep hills but it's got enough power that within a few seconds I'm up to 75mph on a two lane road and have to back off. I even tried flooring it up the hill in 5th while dragging the brakes. I had to give up on that idea when I noticed how hot and stinking the brakes got.