I Have towed with the 4.7 Dakotas and Durangos, they do okay. We had a 98 Sienna with 200K, and it towed a single loaded raft with a plenty of car camping gear in the bed of my utility trailer just fine. The mileage didn't suffer too much, and it would go over Mt. Hood (about 4400 ft elevation) at 55-60 with more power on tap, but I never pushed it. The only thing I didn't like about it was it was only front wheel drive, and that can be a pain in the ass on steep gravel ramps. I never got stuck, but I came close. That got totaled and now we have a 2002 Sequoia, we love it. Plenty of power, 15 mpg towing stacked rafts with overnight gear, and 4wd is very nice. I can easily fit 7 people, and 8 if I stack 3 kids in the 3rd row. I'm a big fan of Toyotas, my wife drove a Yukon Denali with the 6.0 liter (lots of power) but she like the interior and ride height of the Toyota better. I am longing for a 1st generation Tundra 4 door.
Hey Shapp, what brand of header and edu upgrade did you get for your truck? My exhaust manifold is cracking, and your MPG claims sound better than what I'm getting