Pipes might break!
Put at least a quart in each drain (sinks and shower). The RV antifreeze is cheap and plumbing repair is not.
I learned my lesson with my first 35' motorhome. The large, "dump station" pipes froze and cracked. Those were very difficult to fix.
The antifreeze will protect the sink and shower traps and travel down to the dump area.
Don't get any antifreeze in the hot water heater. It will not harm it, but it's hard to flush it all out. The water heater must be drained or it may break.
Your owners manual should have instructions for all of this.
Good luck,
Richard
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2010 Winnebago Journey 34Y
2020 Chev Equinox toad, Invisibrake.
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