The hot water heater is typically counted as part of the fresh water capacity. In my case, my fresh water tank is 24.5 gallons and my hot water heater is gallons, getting me to my spec'd 30 gallons.
I generally keep some fresh water in the tank and use my trailer enough to keep the plumbing filled. For additional capacity, I'm tempted to just keep one or more of my five gallon jugs full and draw water from it for cooking, etc.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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