I think the design function is to serve as a motorized rickshaw correct? Very luxurious in a part of the world where you can see a family of five riding a scooter.
Really the Tuk Tuk is not to be confused with a rickshaw ot scooter. Those are toys not a vehicle. The Tuk Tuk has been designed for every practical use in USA you can think of. Even cros country trips pulling a camper. Remember it is as lage as a truck!!!