You can roll the furnace out with the elements in place. You'll be going about six feet or so and the concrete floor should be a smooth ride. I don't know that I've ever had one break from rolling a furnace around, even on less than perfect floors.
I've thought a lot about those designs Lawrence and I haven't ever got past that one problem. Steel will fail. Try and keep things simple. Don't overbuild it.
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WWUD? Think for yourself.
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