Last summer my toilet would stink up the camper if I had anything in the black tank. The camper was brand new, and I thought this can't be right. In my research I found that the toilet seal was not holding water, and got a lot of advice about how to take care of the seal. We have a very small window of camping time in the summer months, so we put up with it until they did warrantee work last winter. Turns out there was a pipe or valve leading to the toilet that had loosened up and was letting the water drain, it was an easy fix! The water in the bowl prevents the odor from coming up through the toilet.
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