I'm pretty sure that you need the Laeger frame to use the Pro-trax system. So, you have to buy a Laeger frame (ouch!), and then the Pro-trax system seperate. I'm not positive, but I think that's how it goes. Wait! I also think you can graft it onto a stock frame (cut stock frond end off, weld Laeger front end on), but whats the point w/ a stock chassis. dont quote me, but that's what I remember reading. Later!