Assuming that you have sanitized your system before the season started, I see no reason to drain it between trips. We don't, and have never noticed a problem, such as odors, bad taste, etc.
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Deane, Carolyn, and Lainey, our seven year old black lab.
2011 Greyhawk 31DS,:) upgraded from a 2008 Greyhawk 25DB.
2003 Explorer Sport toad.
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