I ordered mine with the soft top and totally spaced selecting the duel top option. As I'm totally new to jeeps I'm not sure about the process of adding a hard top after the stop top is already installed.
Your truck should already have the wiring. All you should need to do is bolt it on. Just a matter of how much a new hard top costs. You may have a hard time finding a used one out there since most people bought the hard top for a reason. Good luck!