a side car you say.... tell me more
Yes, a sidecar. It's very common in the Philippines. They call it many names like 'Pedicab', 'Trisikad'. They do motorized them using pumpboat engines, and sometimes they do call it 'Pumpboat' even it's a motorized bicycle. They use a rope to pull start it. And they remove all the pedals, and use motorcycle wheels and sprockets. It's driven by a dual belt pulley system, that tightens when a pedal is pressed. The pulley goes through a jackshaft with a sprocket that drives the rear wheel sprocket. The pulley in the jackshaft can sometimes be as big as 2 feet in diameter for more torque. The brakes rub on the wheels itself by pressing a different pedal. It does'nt go very fast, but has lots of torque. They usually haul cases of beer, softdrinks, etc... Driving it takes more skill, it tends to turn to the right because of the additional drag of the sidecar, and wears out your front tire more than your rear tire.
The sidecar is attached on the top tube and the down tube, and to the dropouts. Sometimes to the chainstays.
BTW, it's also used as a public conveyance like a bicycle taxi.