I had a 2010 Tundra with factory E rated tires and it towed like a dream. Lots of HP and torque, came on quick and smooth. The transmission on the Tundra never hunted and shifted firmly. The E rated tires kept the truck feeling stable and smooth. We towed a 6500 lbs trailer for several years with the Tundra and it performed flawlessly. We tow in the Eastern US mountains several times a year, never once felt underpowered.
Fast forward to 2015, we bought our new trailer (31' long, 9500 GVWW, 7300 lbs curb weight). We did the math and thought I could keep the tongue weight down enough to stay within my payload rating of about 1500 lbs. First trip we kept it right at the payload but left a lot of "stuff" at home. 2nd trip the wife decided we needed to bring all that "stuff" with us again and we ended up being a couple hundred pounds OVER the Tundra's payload. Fuel mileage was also about 7.5 mpg in the mountains. Again... still PLENTY of power, I could accelerate up any grade and maintain speed up grade. 7.5 mpg and a pretty small gas tank weren't too fun. Being over the payload made me worry about longevity of the truck. We ended up selling it and getting a diesel for better mileage and substantially more payload.
That Tundra was a BEAST though. I wish Toyota would build an HD frame and allow some more payload. The powertrain was great, the quality of the truck was great and the price was better than Ford, GM or Ram at the time.
