I may be mistaken here, but, I believe that there are two distinct 30amp circuits in 'most' 50amp campers. Half of the outlets and possibly say the frig and main A/C are on one circuit and the rest of the outlets and maybe the televisions are on the other. A 50amp line actually has two hot lines coming in with each line capable of 120 X 30 = 6,000watts for a total of 12,000 watts. That is the major advantage of having the 50amp setup. As for the 2nd A/C, it's 'usually' set on the opposite circuit of the 'main' A/C so the two don't compete. I hope I've answered your question with this long diatribe
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Ray