Such typical RV.net dribble.
Some are vehemently defending the brand that they have.
Some are armchair engineers who are using some mathematical formula to try to determine what is possible.
Other engineers are sure about the functionality of brakes being applied by a trucks computer when there is no verifiable proof of it happening.
I think the bottom line is on a test virtually no one on this site will recreate, all 3 trucks did very well, and would have significantly better performance up and down hill than any truck just a very short time ago.
It’s a great time to be a truck buyer, regardless of your preferred brand.