Hi Tim,
I'm in Austin. Your explanation makes sense, but I could hear the burner on the heater trying to light, but it could not light. Also, when I tried to light the stove top burners, they would not light either. It was 4:00AM and the temperature in the rig had dropped about 5 degrees from where the thermostat was set - so it definitely had not been getting any gas for a while.
I drove the motorhome home and when I got home, and parked in the sun, I checked the burners on the stove and they lit. Additionally, the heater worked, but I didn't leave it on very long. Later that night after dark and with the temperature below freezing, I turned on the heater and it lit and worked, blowing out hot air. But when I went back to the motorhome about 30 minutes later, I could hear the heater burner trying to light, but it was not lit and it was blowing cold air.
Now, that it is consistently above freezing, the heater works well, so I do think it is something to do with being below freezing and the propane. When I get a chance I will talk to the propane guys to see if they have a solution.