Her's something I don't quite get. It is the narrow wheels, tires and track idea. I guess I just blindly used narrow wheels cuz that's what seemed to be the ticket.

I however think that a wider vehicle and tire would do a lot better than skinny tires and wheels. IN otherwords, leave the outside of the tires to max width and then allow the extra tire width to extend inside as required. The only tthing I can think of as narrow track is that it makes the steering better and makes the diff case hit less, but I find it just tips over too easy.