[nutmag]

If these are the tires you want to use, and you want a military truck style, I would suggest making a bigger frame. The problem with staking two frames is they won't be wide enough. So bigger more to scale c-channel aluminum would be better. And instead of lifting the frame to fit the wheels, I would lower the frame to fit the wheels. Like the trucks in the picture, the wheels should be about level with the frame, that would be a good suspension height. Hope that helps a little. And where do you buy your axles from?
-Craig