Well, they boys most of the time have it easy. Us girls have to use paper.
With all that paper and water, the black tank can get filled pretty quickly.
I hate to say this, but i put my used paper (#1 only) in a waste basket lined with a bag and empty it often. It's really only a few drops. Saves a lot of tank space. For #2, we use the park's facilities when we can. Otherwise, refer to the above suggestions and use a lot of water, and, of course, biodegradable paper made for RVs.
We are seasonal and we recently on a non-sewer sight, so this is how I stretched the time between black tank emptying. We are moving this season to a lovely new sight with a great view and SEWER! Bonus!!!!
Hope these strategies might work for you to use less paper that is clogging.
Mike and LYnn