Im working on moving the drive axle bearings out farther to the drive cog wheels to give them more support. the 3/4 axles were bending a bit when the tracks came off. I know im just transfering the weak point to somewhere else but thats how it goes. I could make the rear axle spring loaded if I have to. Im making guides between the roller sets to give the guides on the tracks more support as its turning. I think thatll help alot to keep the wheels from rolling over the track guides as its turning. If there were more than 4 wheels or more guides on the tracks it would have the same effect. I may add a spring loaded guide mechanism in front of the front roller but ill see how it looks with just the lower guides first. I havnt had much time to work on it with all the neighbors bringing over their stuff for a spring tune up. But its a good plan and ill get more pics when I get something done.