Are you camping in/using it? If so just fill the fresh tank and don't connect a hose overnight.
If not, it shouldn't "hard freeze" overnight in the 20s. like previously stated by Glitz. If you are worried, then for peace of mind, you can winterize the water lines. But, it shouldn't be necessary.
We camped in NM last week and no problems with temps in mid 20s overnight.
__________________
2018 Aria 3901 towing 2022 GMC Canyon CC
|