I think what the OP is asking: Do you add chemicals before you dump and do you dump everyday while traveling?
Add chemicals to an empty tank along with a gallon or 2 of water. I also add a capful of Calgon water softener. While you travel down the road the solution will slosh around in the tank mixing with the "ingredients".
I'd say, if you're traveling everyday, I'd go no more than half full on the tank. A full tank adds weight and I've heard some horror stories of the waste tanks not being fastened well during construction.
Hope that shed some light on the OP's question.