I've got a 2016 Tundra 4x4 and a 1999 dodge/cummins ram 2500. The tundra has 381 HP, the Dodge has 235 HP. The dodge will out tow it all day, every day, no question, it's not even close.
The Tundra is a strong truck but it IS a half ton, don't let anyone tell you otherwise. I'm not too enamored with Ford lately but if you have to use a half ton to tow in the mountains then the ecoboost is probably better due to the turbo, it won't lose as much power at altitude as the normally aspirated 5.7 in the Tundra.
