6.7 Cummins Engine Oil Temperature?

On a 2016 Ram CC dually, 4:10 gear, Aisin, with 1200 miles on the clock pulling 16,500 going into a 30 MPH headwind at 65 MPH at 100+ degrees the water temp would go to 3/4 on the gauge, the oil temp would be 3/8 inch above center and the trans temp would be 1/4 inch above center, then the fan would turn on and everything would go back down close to center and start the climb again. Also the trans would not hold 6th gear and would hunt 5-6 if using cruise, had to go to foot pedal to control that, then it would hold 6th. That's my findings on our first trip. Hope that helps!