You may also want to check the low point drain that is probably located beneath the tank itself. They are usually uninsulated and exposed to the elements beneath the rig. It will act as a starting point for ice formation and will eventually allow for ice formation well up into the tank. This has been documented previously on the forum and may be worth checking into.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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