Fellow Beavers'. We use whatever paper we want. We prefer the soft stuff that nobody in their right RV mind would ever flush down their toilets in their black tank. About 15 years ago we saw a gal emptying a large oval plastic (its intended use is a juice container) full of used (only liquid) 2 ply toilet paper. We only use this method (2 ply )with the liquid stuff and use the RV paper (1 ply) for the solid stuff. (LOL). She told use to use the RV paper as described above. So when we empty the garbage we just add the contents of the juice container. Then we rise it in bleach water. IT WORK VERY WELL FOR THE FEMALE RVER'S1!
