Inverter and battery sizing to power my camper microwave

This is great info, thanks. I am trying to figure out what the inverters I am looking at have for surge and inrush capacity. I have specs for the Renogy 2000w that lists "peak surge" as 4000 w, no mention of inrush. The Giandel 2200w lists neither. I have screenshots of the specs but dont see where I can attach them here.
So, how do I find this information? Write the manufacturer? And if I do find it, what are the thresholds that are acceptable for my application/plan?