What about going back to the wiki and make use of the fact that amenity=parking_space <https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dparking_space> can be used for this. Make separate parking space areas for different vehicle types. Add parking entrances <https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dparking_entrance> (at present restricted fto underground and multi-level car parks, but I acan see no reason ot to us ita lso for surface parking). Tie it together with a relation <https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dparking#Site_Relation_Proposal>.
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