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I expect ProMaster takes idling time into account when estimating oil changes, not just mileage. I would be surprised if it doesn’t also take other factors into account related to how hard engine is working, like when towing, high ambient temperature, etc... I would read ProMaster owner’s manual.
Having stated above, I suspect you will not spend as many hours idling as you think you may. Many RVers who do not run generators while driving to power roof-top A/C end up using very little generator time. RVers who boondock in hot climate are an exception because they use the generator a lot, but your system is not really optimized for that type of camping anyway.
Other than trying to power roof-top RV air conditioner with batteries/inverter (which you shouldn’t that much if at all), I expect you shouldn’t have to idle enough to make a big difference in oil changes.
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