I would be interested as well but I'll say I did look for a larger truck that would hold more and best I could do was 6 (kids have to be right size to use center front) I currently have a family of 7 so a tail car would be necessary,
One workaround I've thought of is to do a camper shell on bed, and install a seat with seatbelts to the frame. The problem is toys and I've got too many! I want to take my ATV at times and therefore need the bed open for that.
Good luck!