Ideas for a truck to pull 6500lb trailer?

I am a contractor, and have had a 2012 5.7 Toyota supercrew Tundra since new. I pull trailers for work, as well as my 7000 lb boat with it. Other than brakes and tires, I have done very little as far as repairs. It has 90,000 miles on it. Even though I live in Ontario, it is pretty much rust free, and the frame is spotless. My cousin has the same year Dodge Ram, and it is a rust bucket. Any half ton will comfortably pull 5000 to 6000 lbs, but the small engines of some might not be desirable. The tundra has 380hp, and while it gets 16 mpg, it has plenty of hp to get you up that big hill, or onto the highway safely. Just thought I would add this as no one had any real life opinion on the Tundra.