Originally Posted by Terier
it was suggested to me not to have both propane tanks open at the same time so that you will have to switch over when the first tank is empty. By doing it that way you will know when you are actually using the second tank. Of course there are pros & cons for either way so it's a matter of choice.
I see now where you are coming from. IMO this defeats the purpose of the automatic valve. BOTH tanks won't go empty overnight. If you peak at the valve while camping every couple of days you will see the valve is red and still have plenty of time to get it filled.
If you you do it your suggested way, you would have to be AT the camper all the time.
You would have to NOTICE that the check light is ON at the fridge panel and your ice cream is running out of the freezer.
Of course if you are using the propane for heat, you would figure it out pretty quick when your DW kicks your butt out of bed at 3 AM to find out why it is so cold.
The OP was going to leave the camper at the storage yard with the fridge running on propane. If it ran empty and the opposite valve was closed, it would get very stinky in there by the time he got back to the camper.