I tow my tt with a 2007 Tundra 5.7. My 27' tt dry weighs about 4900 lbs. The truck tows the camper unbelievably well-with plenty of power to spare. I usually run in 5th gear, which is the first overdrive, at 2000 rpms. I don't think I would want to pull anything more than 7500 lbs though. I know the Tundra is rated to tow over 10,000 lbs, mainly because of the 4.30 gear ratio, but I wouldn't want to do it. It is a 1/2 ton, after all.