If the size of the gray tank is a limiter, you can effectively expand it by also using the galley tank. Get one of those twist-on external dump valves, ensure it is closed, and then open both the gray tank and galley tank handles. The water level is the two tanks will equalize. Now when you are standing in water in the shower, you can be sure both tanks are full.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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