Hi Butch,
The answer to some of your questions like the different fridge, four batteries, and multi-solar panel, I would call the factory and ask them. For a massive array of solar panels to support four 6-volt batteries, you might have to relocate roof-top items like the antenna, the Fantastic Fan, maybe even the a/c unit a little to gain enough clean space. Best answered by 2551 & 2552 owners (and even for us with our 2350) I've always wondered if the main Fantastic fan would be better utilized in the rear bathroom and have it as your one and only roof-top power vent. With the rig closed up, it seems it would nicely draw outside air in from the front cab, passing through the rig, and out the bathroom where the worst of odors originate. You might have to add a vent high in the bathroom door to allow air to get through when it's closed. Then again, maybe a lot of air gets around the closed door. Just tossing out ideas for you.