Have you seen what they use in ambulances?
Essentially it is a rod top and bottom, with eyelets in the top and bottom hem of the curtain. They are then threaded zig-zag fashion onto the rods. To open them up you "scrunch" them up at one end, and to close them off, just stretch them out.
Seeing as the NSW Ambulance Service uses VW Transporters in some areas, it might be worth a call to the trimmers who do the ambulances.
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