Unless you opened the black tank drain valve, it's still in the tank. Since the black tank has a capacity of 29 gallons, it's got to be pretty full! Look down the toilet to make sure. If so, just hook up your sewer hose and drain the tank (which assumes you're somewhere you can do that!)
You said "new"; does that mean 2017 or thereabouts? My 2015 doesn't have a cleanout hose attachment. Wish it did!
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2015 Thor ACE 27.1
2016 Jeep Cherokee Trailhawk
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