I was told by the parts guys at my local Dodge dealer that all the new integrated brake control trucks are pre wired and to add a brake controller you just pop it in the dash in place of the filler panel and plug the harness in, same with the trailer plug, just pop in the plug setup into the bumper knockout and plug into the harness, then install the missing fuses. done.
Just keep in mind, not getting the tow package may mean light duty cooling and lower amp alternator, etc.. but they say the wiring is all there.