Maybe Chris Bryant has kept track of his "Tune Up your Rooftop A/C" blog post. I had it, lost it, can't find it again.
Our 15K stopped cooling on a recent trip running on "Low Cool" (the lower fan speed). Ran on High Fan awhile and it picked up cooling again. My thought is it froze up on Low, Compressor overheated and tripped internal protector. By the time the ice melted, Compressor was cool enough to start again. Used High Cool the rest of the trip, no issues. This is a Non-Ducted unit, so it doesn't have an actual "freeze sensor." The ducted ones have it and may react differently.