Water management is the key. If you are on a public water supply then it's a moot point….but the holding tanks need attention regardless.
If dry camping you have to conserve water unless you have a water supply and don't mind refilling the fresh water tank constantly. We had a trailer once in the middle of some remote mountains. Black tank wasn't an issue because it wasn't used, but, we did use a lot of fresh water. We had an old military water buffalo trailer that we kept filled from a nearby well and used an inline pump to fill the fresh water tank.....but I digress.
Our tank readings are generally useless and I have given up worrying about them and go by the way we always did. Gray water for the shower will fill up in the bottom. You can count the days and soon you will know when to dump to avoid that. Gray water in kitchen will begin to have an odor as the tank gets closer to full. Black tank sounds different as it gets fuller and will eventually kind of "belch" when you flush to let you know it's time to dump.
Just listen to the trailer....it will "talk" to you
