You want to use the harnesses for "show" or actual 4wheeling use?
I wouldn't run them if you are intending this for a daily driver. I had 4point in my CJ, and 5point in my FJ4O( the crotch strap was evil!) with RCI seats. Very cumbersome for the driver and passenger to get into compared to normal seatbelts. The seats aren't very comfortable or forgiving either. Once you are strapped in; you might find it confining to drive around in. My passengers hated it.
Just a thought...