Replace Toilet with Composting for FT use

I think what you have to think about is that your grey tank will fill up before your black tank anyways. How will you dispose of the grey water? Try to look at how and where you plan to camp. What kind of MH do you have how big are the tanks? Do you have solar to recharge your batteries? What is your limiting resource? For me it is 60 gals of FW, then grey water storage if I make trips to fill FW tanks, then battery recharge, having to do laundry after a week. Black tank is at the bottom of my concerns.