Chuck - yes the "juice pack" is a factory wired 50w panel on the roof and a battery voltage monitor inside the camper. I think that's the extent of it.
With that said, and not trying to be argumentative... If you have the 12v refrigerator (I love ours, BTW, the size is awesome!), isn't the most cost effective answer to this isssue just to buy a small generator to keep the batteries charged? It looks like these deep cycle batteries are not cheap to upgrade your capacity, and a decently sized generator lets you run everything (AC can be a welcome thing...) as well as keeping the 12v circuits alive. The Harbor Freight 3500w inverter generator I have is very quiet, I can just toss it on the fold down back rack that came with my camper. Yeah I know most campgrounds have generator hours, but I think there should be sufficient time to keep the battery alive and then some. Relative to cost, it's probably less than a pair of deep cycle 6v batteries, upgraded solar panel capacity - and more flexible.