If you are worried about "cold" being the upper 20s F for a while overnight, you should not have a problem with the water lines. If your WH is going to be on electric, that means you've probably got shorepower, which means you can also be heating the camper. If it gets colder I'd open cabinet doors where water lines run, keeping them a bit warmer.
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'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL
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