I will provide a "pass through" of some kind under the trailer where I can connect a device like this to the shore power outlet in the campground. It will have a circuit breaker and GFCI and be permanently mounted in an inside cabinet at the front of the trailer.
My battery will be mounted on the tongue and I will also mount a battery charger like this in it's own enclosure near the battery.
The power cord for the charger will be fed into the cabinet and plugged into one of the outlets on the above GFCI and the leads will connect to the battery.
Also plugged into one of the GFCI receptacles will be, essentially, an extension cord which will feed two 120VAC oulets, i.e. one in the cabin and one in the galley (and maybe one on the exterior of the trailer?). They will be hard wired at the outlets.
The battery charger and outlet cord will always be plugged into the GFCI but will only become "hot" when the GFCI is plugged into a shore power outlet.
The charging system and the 12V system will be nearly identical to the one that Joanne posted in the, "now famous", thread.
Does this make sense?
Is this safe?
Is there anything I'm forgetting or should do differently?
I've tried to keep it simple but adequate for my needs. I appreciate your comments

Lonnie