Our 2013 Berlingo was fitted with a Bosal detachable bar by the supplying dealer as a Citroen accessory. IIRC it needed additional wiring and some reprogramming of the vehicle's electrics.
Once done it's a very neat installation and, apart from issues with the car slot for the bar and dirt collecting it's been problem free throughout.
The 13 pin electric socket is a pain if things on the caravan's plug are out of place but that's not a Bosal or Citroen issue.
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