Lean three-wheelers or semi three-wheelers are the way to reduce demand for space and battery power. Better put the two wheels up front, and the single wheel or the clustered rear-wheels in the back for improved stability and road safety. Make sure the so-called reverse trike leans into the corner to shrug off lateral forces. Below: widths compared (with Volvo XC90). Not as narrow as the Mahindra, but as narrow as possible without risking NCAP (impact) safety.