According to some stories, a Suii is merely a makeshift cart, a plank with four wheels employed by yukkuris to move at speeds beyond their usual locomotion ways. It's unknown how a yukkuri manages to steer, stop or even accelerate its Suii. It has been humorously implied that some Suii may have a joystick device lodged where the anyaru is, A Suii may be used by a single yukkuri, or an entire group of them. Especially koyukkuris, being able to fit on an adult-sized Suii, may ride all together as a form of common play activity.