Is the offset and width on the ST6 the same as the RT6's you've seen? If so, I don't know why they wouldn't work like the RT's.

I think Wormgod has had the RT6's for quite awhile now?

Best bet would be to find the wheel/tire thread and look for setups with similar offsets, widths, and tire sizes to see what has worked before and what was required to make it work.