Unfortunately, there are too many variables to say for sure. And, driving versus parked can make a difference as well.
I've been successful down to 10 degrees but that takes a lot of planning and a lot of propane. I.e., no outside hoses, water heater always on, keep inside cabinet doors open, trouble lights in cold spots etc. possible while parked, not so much while driving. And, lots and lots of propane.
Your best and safest bet is to stay winterized and head south as fast as possible. You can use bottled water to drink and use pink antifreeze to flush the toilet along the way. You're not likely to find open campgrounds or water/sewer hookups anyway until in warmer areas.
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