Thanks for the help. Odor happens between campsites, all windows closed, only thing open is the max-fan. Temperature is probably also a factor, we started our trip in Joshua Tree, it was hot. I think bumping down the road pushes the water out of the traps. Once the trailer is set up no problem with smell. I also have a problem discussing holding tanks and blueberry pie!
One more sort of off topic question. Whoever came up with the quote “ Easy as pie “ Pie is not easy, it is hard. Thanks again!