We've never had an issue with the sewer freezing up. We leave the grey tanks open so the volume of water is not enough to fill up the pipe and freeze it. Make sure you don't have low spots in the sewer hose connection where water can pool and freeze.
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Jack & Tanya Wenger
Missoula, MT
2006 Montana 2980RL
2004 Chev 2500 HD
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