Dude. SIX INCH TIRES?
Are you TRYING to break stuff?? A Rustler wasn't designed to take wheels that big. That's gonna put immense stress on the driveline. Stick with dogbones. They're cheap, and are stronger than most CVDs. Stronger, not smoother. And cheaper. Good luck keeping the tranny in one piece too. I hope you're at least gearing that puppy down a good deal.