Remove the p trap & check it out, possibly a plunger, but don't use a snake. This, as you called it, is "jinky Thor" plumbing going into a plastic tank so a snake is not recommended or could create other problems.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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