I have never had a fixed towbar set of the reversing sensors on any car we have towed with.
We have the XC90 with oem retractable towbar, even when deployed there is no triggering of the reversing sensors by the towbar sticking out, but still detect obsticals so are still active - until you connect the caravan.
More importantly as referencd by whyman is to use the oem electrics.
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