Short answer to your question is both legs will be hot at 120v. That said, they will "share" the total 18.75 running amps. No load balancing. If one leg is pulling 15 amps (your main A/C) there are still only 3.75 amps left to share between the two legs.
Add up the amp load from both A/Cs and your over the running output for this generator.
1725 watts Main A/C + 1300 watts bedroom A/C = 3025 watts or 25 amps. This does not take into account the start up power requirements.
So, I'm pretty sure you'll be a bit short on power for both AC's if that's your plan.
Plus, that open frame generator is really noisy (73db) compared to an inverter type.
2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
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