[gearhead]

Congrats! Those things are towing beasts. You'll love it.
Cummins wants their engine to work for a better break-in. I would drive it easy a couple hundred miles and hitch it up.
Check your brake controller selection on the driver information screen. You will want it set to "Heavy Electric" brakes.
If you get in big hills you might want to lock out 6th gear. The transmission may want to shift a bit too much with the 3.42 rear end. Most times I just put mine on cruise control and get after it. Sometimes forget to use "Tow/Haul". Use the exhaust brake on max to warm up the engine faster and when you tow.
Good move.
Hey...is I-35 north of Ft. Worth complete yet???