30 degrees for 3-4 hours...
It's supposed to drop to 30 degrees for 3-4 hours overnight tomorrow, then well back into the 40's during the day. It seems that getting just below 32, for only a couple of hours, should be a non-issu...
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I've camped in colder weather and had no problem. It probably won't get that cold inside your rig anyway. If concerned, you can open faucets to relieve pressure buildup.
