As Glenn said. We used to take a tank off and use it to run our propane campfire till we got a separate tank. Worked fine. Also if you’re staying somewhere for several days and run out of a tank and don’t want to or can’t switch to Electric water Heater, or shut the furnace off, you can run on one tank and go get the other one filled without a problem. If it’s a situation where a fill station or exchange exists. Personally I only fill at fill stations and keep the original Escape Tanks.
Strike while the iron is hot. Live every day as if it were your last and one day you will be right.