I posted this earlier today in another discussion:Correct, but it’s also been stated that it is a royal PITA. But, technically you can add it later.
Even if you got the factory tow package you would still need to install or have installed the trailer brake controller (it is not included with the tow package)
The Curt hitch and wiring for 4 pin is around $200 and a separate brake controller is another ~$200 and ~$100 for the 7 pin wiring kit -about $500 total before installation
The factory setup is $595 + ~$250 for the brake controller - about $845 (still have to install brake controller)
I would find it hard to believe that you could not get a reputable shop to install the hitch and wiring for the $345 dollar difference (actually more if you figure in installing the brake controller on the factory setup)