gramma3, i had the same problem with a previous trailer. It was just as Stan said. the toilet emptied onto the sloped edge of the tank and had little clearance. I found advise on another forum to solve the problem. Remove the toilet and check the length of the drain pipe, i had to shorten mine a couple of inches and it solved the problem.
Just speaking from my experience, hope this helps.
Peter
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2012 Z1 271BH
2009 F150,4.6 3V. 3.73LS,9.75"
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