While I wait to get a decent photo of our new-to-us Yokota Twin Peaks tandem, here's a pic of my friend's very long rig: a Greenspeed recumbent tandem (that can be taken apart and converted to a single), towing a Greenspeed Lamb tag-along, towing a WeeHoo. The family lives car-free and they all ride bikes of various kinds. The tandem features a Rohloff, a Schlumpf Speed Drive, and Hope disc brakes. More at
RGB's cycling page