If you are worried and you have access to power, put a small ceramic or similar heater on low inside the rig with the cabinet doors open where there are pipes. That should keep pretty much everything a bit above freezing. Actually, at the little below freezing, a couple of 100W incandescent lights would probably give off enough additional heat to provide some peace of mind.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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