with same futon frame as the Bango, but back-to-back tandem configuration. The wheelbase is extra long (102in, and very bouncy). No cargo side rails yet, which should stiffen the frame a little bit. Not sure what to do about the rear seat either, although the stoker can ride lying down or leaning against cargo. 2 additional wheels can be added to mid section for stability / capacity... https://www.youtube.com/watch?v=8VQlk09qdDU ; Cheers, Vi