texasAUtiger wrote:
To answer those who asked: we did NOT have the exhaust vent running in the bathroom at any time during the trip.
...and sometimes the wind direction can do the same thing.
But as a read things- it does sound like good ole hot weather.
If water is not limiting, you may also want to consider dumping more frequently- in which case you should probably waste some extra water to get the tank fuller for dumping.
And, by the way, leaving the gray drain open does not cause black tank odor. It is OK to leave that open, though some will hotly disagree and cite their reasons (which may be valid too).