Get up to or on the roof, you should have at least 1 black tank roof vent. It is common to have a fan pulling black tank odors back into the trailer. With the current TT I have, if the bath vent is fully opened odors can come back into the bathroom as that black tank roof vent is real close.
List the RV model your discussing and it may help with a more direct answer.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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