Wow, always an interesting topic that gives me a few chuckles. I do find it absolutely disgusting that some same their used TP, used TP has to smell and is so unsanitary. Also, 15 years ago when we bought our first TT and had a bathroom was the last time I had to go into a campground bathroom, it was the main reason to upgrade to a trailer with a bathroom, got to have your own thrown. As for water, never add 5 gallons just a couple and yes I use liquid aqua chemo because I like to, cost about $12-18 a year.
Anyway, enjoyed the thread, have not had issue with the tank or dumping and the smells are no different than at home so unless you run out to McDonalds to use their bathroom then all should be fine.