leeper wrote:
When I read your post I heard that you went camping, used the toilet with no chemicals in it, then drained the tanks, and then you added chemicals after you where done using it. No wonder it stunk! You first put in the chemicals with water, then use it, then you drain the tank of the chemicals and what ever you put in the toilet! Chemicals first and not last when you are done. When you put the chemicals in with a little water and let it sit for several weeks the chemical lost its potency and things got stinky. Chemicals need to be renewed in order to keep working.
I guess the way I read the OP is that he does what I do. After draining the tank, he "recharges" it with chemicals, and water so that it is ready to go for the next time. I don't think they said they used the tank without chems. I guess we wont know until he/she comes back for sure.
If this is new trailer, then I'm going to go with the roof vent might be partially/fully plugged.