I don't know your specific coach, but in my experience as long as the interior is not all that cold, say 50+ degrees overnight then the water pipes won't freeze if it gets down to the 20s at night as long as the outside air temp warms up above freezing, say 40+ degrees during the day.
Since they are usually exposed, the grey and black pipes upstream of the block valves can freeze partially, but usually don't freeze solid in the conditions noted above.
David
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2021 Thor Axis 24.1
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