I have provided proof points (bigger brakes, bigger rear diff, bigger tow hitch components, lower gearing)...you just don't seem to consider any of them valid...which is fine.
It seems that your "experience" is no more credible than mine. I've driven both as well. The Tundra did not "feel" any less capable when towing similar loads than did the F-150...but we're well beyond objective stats comparison at this point.
The F-150 can no doubt stop in a shorter distance, when empty...it's a lighter truck. The relevant question is how both (Tundra and F-150) compare when towing and stopping a heavy load.
As for the tunability of the 2.3l ecoboost...that's great to hear that the tuner and mustang crowds are having fun with it. High horsepower engine tuning and overlanding really don't belong in the same sentence...but if you want to test the waters, go right ahead.
1. No one is saying that the Tundra does not have larger brakes, ring gear, or hitch. What numerous people are saying is that size does not in any way mean they are stronger. Every aspect of the Tundra is rated to do less and it's performance numbers also dispell your points. The Tundra uses decade old materials and design... This might be news to you... But better materials and designs are available today. Remind me... Which truck has a fully boxed frame?
2. The F150 has a 10 speed with a low 1st gear, it has zero use for the lower rear diff gears that the Tundra actually needs. If you get either EcoBoost then it makes low gears even less useful.
3. That's cute, you have "driven"both. I own a 2017 F150 and have had a 2013 and 2016 as work trucks. I have owned a 2002 and 2014 Tundra. I have hauled the same loads and same trailers with both the F150 and Tundra. The F150 outperformed the Tundra with out any doubt. Don't take my word for it though, there are plenty of news articles and YouTube videos that drive the point home. Or, go to damn near any camp ground and talk to F150 owners. There is no shortage of guys that have ditched their Tundra for an F150 because of the towing performance and fuel economy.
4. I never once said that the Tundra was in any way inadequate. Just because the F150 is better in no way implies that the Tundra is a bad truck. If an Olympic athlete is faster than me in the 400M does that automatically imply that I am slow, or that he is simply faster than me? This is not a zero sum game.
5. I have pulled the exact same travel trailer with My F150 and a Tundra, the F150 hands down stops it in a shorter distance, with less fade, and less peddle travel required. It also accelerates with far less effort and pulls hills with ease. Same trailer, same roads, same amount of people and cargo.
6. There is zero proof or reason to say that tuning the 2.3 will have negative effects. As I have said numerous times on this forum, you'll exceed the flow of the stock HPFP long before you will compromise the motor.
As for overlanding and tuning: when someone adds a lift kit and larger tires its far cheaper (~$400) to tune the motor and increase the power than it is to regear. You can have more low end power with no compromises... Try that with a naturally aspirated motor.