On my first camper, a Starecraft pop-up, I had a Thetford Cassette and it worked well. I want to say it was about 4 gallons. I think it is better than a port-a-potty because all of the exchange of the cassette is on the outside of the camper and not inside with a port-a-potty. And if they have not changed it, the cassette style has a spout that makes it easy to dump.
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2018 Jayco Eagle 355MBQS, Andersen Ultimate Hitch
2013 Rockwood 8281SS 5W, Reese Revolution (sold)
2016 GMC 2500 Denali HD 6.6 Diesel
2016 Victory Cross Country Tour
2012 Toyota Tundra Crew Max (sold)
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