I always keep my fresh water tank full to allow for water line breaks at the park. It happened 11 times last summer where I volunteer. So far this summer only 1 time, but I always have water. Since it is so hot right now I switch to my fresh water tank once a month and use it for a few loads of laundry and a shower or 3. When close to empty I fill it back up for the next time. Others around me are always upset with the water is off, but I'm good to go. I got burned once with an empty tank and never again unless it should go off when I'm cycling the tank.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof