Just to make sure there is a little different opinion--we leave water in the tank for two or three months at a time with absolutely no ill effect. You may dispute this, but if the tank has been sanitized correctly (once a year or so) and you put chlorinated water it, no bugs or gunk grows. And we use that water for everything--no bottled water.
That said, we don't travel with a full tank just to keep the weight down, unless we are heading for dry camping.
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Earl
2007 33.5' Arctic Fox Fifth Wheel used for full-timing for several years--now sold
2011 Hideout 23RKSWE that we now use for poking around local parks
2007 Chevy 3/4 ton diesel with Prodigy Brake Control
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