After 3 years, our toilet developed the same problem. Well, actually we had the "water won't stay" problem two years ago, but a good cleaning of the seal and a couple of the foot-slams fixed it. This time, alas, nothing has worked. So, the new seal kit is sitting on the counter and will be installed tomorrow. We hope a bad seal is the problem because that's a relatively easy fix.
In the interim, to keep odors at bay, we've used the water-in-a-plastic-bag sealing method (from Waynem?), and it's working like a charm: Fill a small baggie with water and drop that over the valve in the bowl after the water leaks out. You have to remove it to use the toilet, obviously, but it surely has worked to keep then black tank odor out of the trailer.
Carolyn
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