Dan, for now all I can do is to carry extra water in portable containers. I developed a pump system which allows me to pump the water from the 6 or 7 gal containers I purchased at Wal Mart into the main tank without lifting them to pour them in. A little 12 volt
pump does the transfer. As I almost exclusively boondock, yes, it is a real issue but I knew it when I decided to buy a new rig. I was out for 9 days and got back last week, and had to add my water stach of two, plus one extra container.
BTW, the 23 gal tank also is on the 23' FC, and the smaller 19's and 16's.
As I get older, even hauling 6 to 7 gal of water around (50 pounds) by hand is not something I look forward to, and then there is the place to store it in the Jeep, plus the weight there.
Sometimes I wonder about what Airstream is thinking when they decide on new changes. I guess that since so many people almost exclusively go to full hookup campgrounds, AS has moved away from good boondocking capacity in water and electrical systems. However, I think that they should develop a "boondock package" with larger solar systems, and bigger tanks as an option for those, like myself, who do use their rigs when not hooked up to services. Is anyone at AS listening? I would trade a good water system any day for the fancy TV-DVD-Radio that they include as standard on the FC series. I don't go out camping to watch TV.