Today I fixed the sewer odor problem in my 2000 Tradewinds. We just bought this MH in October, but it had real problems with odors. After researching and read threads on this and other forums, I realized that the problem most likely was the toilet seal. The new seals came in yesterday and I replaced them today. What a disgusting job! Worse than any house toilet I've repaired. First thing I found was that the clamp was not torqued to 65 in/lbs. It was almost loose. The seals were gross!. Anyway, after I cleaned everything up, installed the new seals, and torqued the clamp to 65 in/lbs, the toilet holds fluids. I think the problem is fixed. I sure appreciate all of the knowledge and insights I gained from this forum. Didn't make the job any easier, but it helped me resolve the problem. Once the weather is better, I'll probably install a vernturi vent cap.