I have a 2012 FJ that is a very basic model. It came with the convenience package and a rear locking differential. Through the forum I learned that because of the rear locking differential, I could just add the A-Trak button and have A-Trak. I have slowly customized it by adding the Trail Team blackout parts, new wheels, and recently All Pro sliders.
Good luck with your FJ. The forum is a great place, with lots of great threads on all sorts of things and great people.