Jim, not an expert on this but I think the propane situation is correct. If both tanks are on and one goes empty the other one should kick in. Just make sure to watch the gauge for the red mark so you can refill the empty one.
In cold weather I usually leave water in the fresh tank so if the campground water freezes we have water in the morning.
I believe as long as you are running your propane heater the tanks should be OK for short periods of time. Usually it warms up in the day and the tanks are fine, but don't take that to the bank, it's just what I think.
Ray
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