A tracked mobility device includes: a) a pair of independent, self-supported track drives defining a planar ground contact area; b) a multi-directional wheel having a raised position above the plane of the ground contact area, and a lowered position below the plane of the ground contact area; and c) an actuator for moving the multi-directional wheel to either its raised or its lowered position. When the actuator lowers the multi-directional wheel, part of the planar ground contact area is raised from the ground without raising all of the planar ground contact area from the ground. Each track drive functions independently so that bumps along one track may be traversed without tilting the entire vehicle. Each track drive may be attached to the vehicle body with flexible mounts that allow each track drive to independently tilt upward or downward as the device moves on its tracks.