[rhagfo]

Originally Posted by WDPatterson

As I said, there is no real automatic valve. And, when the temperatures Get Low enough, nothing is trustworthy due to the expansion and contraction properties of propane. Remember, your operating at less than 11 inches of pressure.

Well I would say you are wrong with that statement! While many choose not to use the feature, many of us do, and they work great!
We full time park host, and normally heat electrically with our furnace, if we have a power outage we switch the furnace to propane. When we do that I will check the regulator morning and evening.
We now carry a third 30# tank, as we once had a ice storm and we’re without power for nine days, and it was three days before we could get out to get more propane.