I have a 2014 Alpine 3600RS fifth wheel. Just got out on the road today for its maiden voyage. Got to the RV park and have had a very strong sewage odor in the coach, but not outside or in the stor...
Pour water down all the drains. P-traps evaporate. Especially fast in hot weather in an RV just sitting empty and not being used.
And yes 'some' RV bathroom sinks drain into the black tank.
My bathroom sink drains into black tank and if I don't use that sink everyday during the hot weather the p-trap water evaporates. I know when I start smelling sewer odor.