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Ozz,
If you read the description of the reverse polarity fuses at the top right of page 2 of your first link it says they protect the power converter if the wires to the battery are reversed. I don't see where this has anything to do with shore power/120V/220V coming to the camper/converter.
The only time they should blow is if the positive & negative battery connections are reversed to the converter. This could be at the converter end or the battery end.
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