I once read a post some where on route 6x6 about a man who took the factory tracks off of his Max II, but decided to leave the external frame rails and outer bearing cages on. He said that riding with out the floor boards ,and with out the outer frame rails and outer bearing cages , you could actually see the frame flex up and down, as the axles moved up and down on the outside of the tub. He also said that with the outer frame rails and outer bearing cages now installed, riding his Max II fast now feels a lot more stable than with out them.