Would you "do" a cassette toilet?

There is an inexpensive option that you might consider. There are toilet seats available that snap on top of a 5 gallon bucket, just the right hight as a toilet. These use plastic bags and pouches that are disposable. It sounds a little gross but in reality it is probably more sanitary than emptying a cassette or black tank and you don't need a dump station, just a trash receptacle. We had one in a conversion van once and years ago in a travel trailer when our children were young and they worked out fine when there were no rest rooms available or at night. If you're boon docking without neighbors, you can just use it outside.

Nick