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I have an 01 SuperCrew with the DS Predator tune and have towed 3500lbs of trailer and ATV's wilthout any problems. Of course I used premium gas and didn't use overdrive. But I did run the truck up to 70MPH and also climbed a pretty steep gravel mountain road pulling the trailer. No problems. You know you can retard your timing with the Predator if you are worried about .