I agree with the comments so far. I have been running a 2.2 Race King tubeless on Flows for some time now on the back of my SS. Great performing tire with a plump casing volume for a 2.2 and it rolls well and hooks up much better then you think it would.
The Mt King is a mixed bag IMO. In loose or mulchy, muddy soils it is really good. On hardpack, the tall side knobs are like tiny gummy bears and leave me with vague steering. And, as was mentioned the new design makes all that old news. The new version I saw looked like a tire design with an raised, aggressive center tread and lower set side tread, and with a gap between the two sections of tire. But that was a quick peek as I remember it from I-Bike.
However, the new Race King 2.2 is quite the front tire so far. Only two rides on it...about 7 hours so far in mostly dry, sandy, dirt over hardpack, acorn laden trails and roads, but it has been a solid performer. I need to measure it after a few days of being tubeless, but it looks to be the same width knob to knob as the Race King 2.2 is sidewall to sidewall.