So far the only rear conversion I've seen is SSATV's, and from the reviews I've seen, that kit isn't working very well.
I saw one guy on another board who converted the SSATV kit to hydraulic and I think it worked better that way, but still left a lot to be desired.
I saw one guy on another board who converted the SSATV kit to hydraulic and I think it worked better that way, but still left a lot to be desired.