Ed I can see the advantage. You basically use the chassis as it;s own suspension. It is it's own springs and shocks. The difference, even using the same wall thickness would be the same as making a leaf spring out of mild steel or a spring steel with a lot of carbon and tempered to retain it's memory. There is a ton of deflection in a kart frame. you can pick up a front wheel sometimes up to 8 inches before any other wheel comes off the ground. You control it with ride hight, wheel offset and seat and mounting points and just moving weight around.