I totally understand the issue of having only 1 inverter outlet in the entire camper. My Montana High Country Fifth Wheel (2019 model) has only 1 inverted plug, and that is the one for the refrigerator. So, what I did was plug in an extension cord with multiple plugs on the end. I now plug in the refrigerator, and I also plugged in our WIFI (Visible Phone and mini router) too as a protection for when we experience power outages (which does happen occasionally). Our computers all flip over to their own battery power when we experience power outages. (My wife still works full time remote, she must have an uninterrupted internet source). So, this works.
Maybe, in your case, run an extension cord from the known inverter plug for the air frier.
About the air frier? All you can do is try-it, and see what happens. But, I have a feeling it will drain the batteries pretty fast. As long as the amp draw is less than the amp output of the inverter, you are good to go. It then depends upon the charge in the batteries.
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About the time everything starts going well, something else breaks!
2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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