Lots of responses here. Thanks.
Apologies if I don't hit every one.
1. Consensus seems to be there's no harm with using different controllers with different set points for the various stages of charging.
2. Don't trust the levels. 2/3 is the new full. BTW, the shower does drain into the same tank as the bathroom sink. The black water tank was empty. It's never been used but I opened the valve anyway, because some showers do drain there. Dealer said there could be a check valve to help prevent these sorts of oversights from overflowing onto the floor.
3. The wine cooler is an Everchill unit. It is supposed to cool to near freezing but the glass door makes cooling inefficient. It will disappear at some point and be replaced by a conventional dorm fridge.
4. Short power is available until we demolish the old structure. Then it could be 6 months or 6 years until there will be another functioning RV outlet. I do have several generators, including an inverter model that has been converted to run on propane. We tested it for a weekend. 5 hours of daily usage with the AC at max setting and some microwave and TV used 3.5 gallons over on an 11 hour period. Pretty efficient, I'd say. Anyway, rather than add two more panels and two more flooded batteries, perhaps I'd better bite the proverbial bullet and upgrade to Li Ion batteries first. The most painful part would be over with and I'd have the same capacity as I currently do, but would have a better discharge rate and not need to concern myself with battery maintenance. A second battery and set of panels would happen if there was enough electrical demand.
Thanks again for the assistance.
