Hi,
I have had a detachable tow bar fitted by volvo,expensive £750 fitted also adaptor leads for the different connections on trailers and caravans,they provide a cover plate for when the tow bar is not in use.
I use mine for towing a caravan,check out Thule's website ,I'm sure they can give the info you require,also i think a company called westfallia do racks for towbars.
Rgds
Squidd
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