Thanks for the update, OP!
We have the same truck and tow a 7,400 pound trailer (loaded). We have taken it throughout the Midwest and South, including the Smoky Mountains in Tennessee.
I could not be happier with the way the truck has performed. After hearing some people on this board, I was expecting 5,000 RPM going up a hill and maxing out at 35 MPH. Nothing could have been further from the truth. As long as I anticipated the big hills, the truck did great. Had to get over to pass several big rigs.
Safe travels!