Ive run tubeless Race Kings for the last few years as well. Seals first time, every time and had no issues with leaking sidewalls.
Run them on Mavic SLR and Crank Brother Rims.

Another here with no problems getting Race Kings set up tubeless on Arches. However, I managed to puncture the sidewall and couldn't get it to reseal and didn't have any anchovies. Loved those tyres for comfort, supple sidewall good for that, but no doubt fragile/not great for 15stone rider. Only ever used the RK out back but always loved how it performed across mixed conditions, thought it was much more capable in mud than it had any right to be. I prefer it to the Saguaro, which I find need to be run with relatively high pressure to stop them 'folding' in off camber sections.

Both good tyres and quite capable for relatively fast rolling treads, but neither great for heavier riders in more challenging terrain IME.

I now run both on my 'offroad commute' bike, Saguaro, up front/RK back.