Thanks again Itinerant1!
I think I know my answer. I’ll pass along the recommendation to Magnum that they should look at how the inverter in load support (or even pass thru) interacts with generators under heavy surge conditions; if they can make it more tolerant I believe the issues I’ve experienced would go away. Regardless, no need to swap out my 3012 as the next one would behave the same. When we get home I’ll put soft starts on before the next summer trip. Certainly don’t expect to deal with the heat we have had this summer again though (a couple weeks above 100deg traveling ~PNW, including a few days >110!).
Glad to know you’re happy with your system. Other than finding this issue when coach was 100deg inside I am as well, and plan to bring the Magnum charge controller into my system next year along with some solar.
Safe travels