When I got the KJ, My wife wouldn't let me wheel it either.
Here is how you break her.
Start off slow and easy take the family to a National Forest or Park for an outing, or camping trip (it is a jeep). Enjoy driving around on the dirt forest roads and enjoy the scenery. During this period work in little purchases like skids and tow hooks, all of which can be easily justified.
After a few trips hook up with a few other jeepers in the area and explore the forest for the day or weekend, stopping often to explore on foot, hike, sight see and enjoy the company of like minded individuals. After that trip she'll understand that the need for a CB for jeep to jeep communications.
Then about a week or two after your group run, tell her that the LOST Ohio guys are doing an easy trail run and see if she wants to hang out with everyone again. Your KK can handle an easy trail without any problems really. Tires may hold you back a little, but with hooks and other KJers you have nothing to worry about. At the end of the trip she'll OK the lift and tires.
Then every few months you just work in another mod that you want.