After reading that thread, (which I haven't seen my post get attached to yet), I have an additional question.
If the positive lead is a fused wire coming off the + battery terminal, and the negative goes to a chassis ground, where does the inverter ground go? If you're using it as a mobile power station, are you supposed to get a metal rod out and stick it in the earth and connect? Not a big deal to leave it off in this case? Just curious what actual experiences you all are having.