I was running my "Another Monster Wheelset around on my newly dual-celld car, and my conclusion is that the first time you smack the wall with one of these cars it will break something!
I am shelving my even larger wheelset for the moment, mostly because I want to make another Lego Wheelset with the Zip Zap wheels I have.
Another reason is that huge heavy wheels are simply overtaxing the drive and steering systems and while I may try a tri-cell soon to see how it is, doing a brute-force approach and dumping more power into the system is not the best solution.
It's the weight of the wheels that killing it from what I can see.
A big huge set of foam wheels would be perfect. Heck, use closed-cell foam, and the stupid thing might be a puddle-jumper too!