Now I don't know how different SC is, but I tried this in MI with my KTM450XC (atv) and it was a struggle getting them to consider it and since its a sport quad, does not help, at all. The DMV really frowns upon the straight axle, they feel it will flip too easily compared to a independent rear.
Of course you'll need the mirrors turn signals, etc, and DOT tires, but that isn't the real issue, just a matter of money. They were also worried about noise, which is rediculous because I have the stock exhaust (unmodified) on it...it became clear it was going to be a constant struggle so I ended up bagging the idea.
ps-pics of said quad?