composting toilet

MK, you may be better off with a chemical toilet for your R V, normally used with a storage tank. Most RV stations or camp grounds should have a pump out for a fee or direct sewer connections on site depending on how long you stay. Composting would be a great idea but the main thing, as you said, is dumping the peat when needed, most people wouldn't understand what it is and would consider it dangerous or hazardous, and carrying or purchasing peat on the road may present problems..as far as how often you have to change the peat, of course that depends on usage...some toilets come with an electric dryer that extends the life of the peat.