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One thing to sure of is to not leave any of the valves open except when dumping. Then after dumping walk the hose down from the output of the rig to the drain so there is nothing left in the hose.
Most of the time (not saying you have done this) when a sewer hose freezes it is because there is some continuous drain (trickle) going through it. The use of running a trickle of water during cold weather is what we used to do when we eventually got running water on the farm. But that's a no-no with RVs. It'll freeze every time.
Orv
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