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The 12v batteries (13.6 means the batteries are also being charged successfully, so you are right the batteries seem good) are used to control the circuit boards that help pumps and electronics run for both the fridge and heater (and furnace and all other 12v lighting, etc.)
It appears you are having propane issues. In combination with the 12v circuitry, propane is used to fuel the heat sources to heat the water and operate the fridge per the 12v used for the control boards.
Besides that you are out of propane, there are many other things to consider. For example, the propane bottles do NOT have to be empty, they could be so low that there isn't enough propane to keep up the pressure to provide the fuel. Topping off the propane tanks will help. Other flow issues might be caused by faulty regulators. Since you probably have two tanks, maybe the autoswitch didn't work, or you are just plain out of propane. If one appliance works and another doesn't you could have a bad appliance for a particular fuel source (110v electricity works, but propane doesn't). There are two regulators in Montanas - one is on the passenger side (secondary tank) and has a small regulator that has been known to be undersized (should be 30 psi, but I had to swap out my lower rated unit), the other is a larger dual input regulator that may or may not have an autoswitch to control which tank is being used for supply.
I'd concentrate on debugging your propane supply. If you need more help, describe your new findings and you should be able to get help here beyond what little I provided as a start. Best of luck.
BTW - Great profile name, "emptynest". For many of us, that is so obvious, I'm surprised no one has used it yet (including me, lol).
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