Yes, its been hot here.
Your plan will run into many problems, starting with large mini splits won’t run on 120 VAC which is what your generator makes. 3 Tons is hardly “mini”.
I suspect you may have existing A/C issues that should be fixed first. I’d start by testing cooling capacity of each A/C first.
I’m not certain an Onan 5,500 won’t power three (3) efficient 13,500 A/C. I’d research that if you don’t find cooling issues with existing A/C and or motorhome.
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