Seeing the, ahem, 'discussions' about what vehicle can tow what trailer, I thought you guys might like to see this photo (not mine) of a very similar-sized Weferlinger trailer being pulled by a Bond Minicar Mark F. The Weferlinger was effectively an East German copy of the West German Schwalbennest.
The Bond Mark F (see Microcar Museum exhibit
) had a 250cc single cylinder engine producing all of 9.5hp (and what use could a sane person have for more than 10hp?). If you follow the link, you can see how this entire motorcycle engine and gearbox was suspended in front of, and drove, the front wheel, turning with the steering.
And the bicycle? My guess is that it was carried so that when the outfit got to a steep hill, the passenger got out and pedalled since clearly the engine couldn't get them all up a hill. Or maybe the bicycle hooked on front of the car, 'double heading' like a railway loco?