First let me thank everyone for all their help. I need just a little more reassurance. I'm including some pictures as it seems that different pods have different configurations.
First picture is my panel box.

Next is behind the panel box.
First are my labels correct? It seems the AC ground bus is inside the panel box along with the AC common bus. The DC negative appears to be behind the box. Checks out with volt meter as I get 12v between DC fuse positive connector and both DC negative bus and AC ground bus.
So my inverter has a positive a negative and a ground. I'm thinking this... positive to DC panel fuse (20 amp) Negative to DC bus behind the box. Now I'm unclear on grounding DC circuits and the difference between a DC ground an DC negative. But I was going to take a ground wire from the Inverter ground post to the AC ground bus. Does this all seem correct.
Thanks so much. I'm going to get this... eventually.
Deb