Answer with humor: Park the rig with the bath vent upwind all the time.
Answer with spending your money: If your rig doesn't have a Fantastic-style bath fan, a Heng's, or similar, installing one, and leaving it on would keep the fumes from entering. I can't think of a viable way to alter the tank vent that would be 100% effective all the time. perhaps someone else has had the same experience, and will share a fix.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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