With all modern engines, the optimum RPM is where the computer sets it. There is no red line or bogging.
Put it in drive, hit the TH if over the manufactures settings and drive how ever fast or slow you want to drive. It's really that simple.
Some "think" that can get better performance out of their engine by manually shifting it. Good luck with that. Not going to happen in 99% of the cases while towing. The manufactures know exactly where the set the shift points to get the most out of their engines performance.
2016 is not like 1970 where that C6 or TH400 would not shift exactly where you wanted it to do you the temperature of the ATF or the altitude you tow at or the load you have.
Modern computer controlled engines and transmissions are amazing. Just let them do there thing.