Not too sure this will help....
My wife and I wilderness dry camp. We learned that if we use the trailer toilet we can only stay about a week before the black tank is full. So we took the porta potty that we had from our previous tent trailer, and use it for ALL liquids, and the trailer toilet for solids, which gave us the ability to stay 3+ weeks before having to dump the black tank. The porta potty is easily taken away from the camp and emptied into a forestry vault toilet if available, or in the wilds that we are usually camped in. It sure beats having to haul all of the liquids and solids home with you!
Beachnut