A wheelchair suspension includes a frame (402), a pivot arm (404), a front caster (412), a rear caster (414), a stabilizing system (420), and a sensor (422,424). The pivot arm (404) is pivotally coupled to the frame (402). The front caster (412) is coupled to the pivot arm (404). The rear caster (414) is coupled to the frame (402). The stabilizing system (420) is coupled to the frame (402) and the pivot arm (404). The sensor is coupled to the stabilizing system. The sensor (422,424) is arranged such that tipping of the frame (402) causes actuation of the stabilizing system (420) to at least partially resist further tipping of the frame (402).
