[RC-Monster Mike]

I was thinking the 7xl on 16 cells. With enough reduction, this combo would move that thing out in a hurry. A buddy of mine made a 6 wheeled e-maxx (and sold them/sells tham as kits). He has a website where he sells them, along with some info. He made a custom diff for the "middle" set of axles with an additional outdrive on the other side, which sends power via another driveshaft to the rear wheels. Perhaps this diff is available and may work for your project, or at least give you an idea on how to make it work. i will try to find his website for you.