If your p-traps are dry, smells from the gray water tank may be the source. Try pouring some RV antifreeze (or some water and vegetable oil) into each drain. If that was the source, then you should be fine.
Another possible source is an air admittance valve. Those are used some places so the drain system doesn't need a vent stack connection.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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