are you selling these things, or just showing what you made??

I would make that so weight could be added to it, as in my area with rocks and heavy matting, it wouldn';t do anything but bounce up every few feet and do much as is??
but nice idea? just needs a little tweaking I think might even be able to add some air shocks to it, real easy to aid in down force and have the eye bolts to be able to slip on and off fast like?