Not sure about the dash, but seems pretty normal to drain over several weeks if it isn't re-charged somehow.
Have you considered plugging it in sometimes? Or add a solar panel/SCC to keep the batteries topped off?
You could also do some measuring at the fuse panel to see what still draws currency when all seems to be turned off.
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2022 Thor Rize 18M (sold) now a 22 Honda Odyssey
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