So what you’re saying is, is even if I set the up shifts to 100% tps and the downshifts to 0% it will still shift up/down under load? Does tow haul mode take priority when tow and manual mode are both on?

And since you have knowledge on turbo truck towing, what kind of rpm range and psi cruising should I be looking for?
The hardest towing trailer I have is a 10000lb toy hauler that’s about 11-12ft tall. 5th would be 2600rpm at 70 and 4th 3500rpm.