These are called "Trophy Karts" and are like 1/2 scale Trophy Trucks like the ones in CORR. They are freaking sweet!
They come with a 10, 18 or 52hp motor. Automatic CVT transmision. Tri-Link rear suspention, and A-Arms in the front with coil-overs at each corner allow 18" travel in the rear and 15" in the front. Only thing is the price, like everything else... a base model is $6000. I'm starting to save now!
They are avail to the public, but I havn't found any racing in Arizona. I'd really like to go test one out.
Here is a vid too.