i found one on Ebay, it mounts to the back where the hooks are. it was made out of aluminum, looked pretty good. i can't remember where on ebay but do a search and you should find it.
I just bought A renegade 800 and the guy fabricated a rack for it seems really sturdy i will be adding a seat for kids so they can ride with me and i can pack lunch and some light gear, if interested let me no I will call him see if hes interested in making more he also did a awesome custom snorkle kit as well as winch bumber.