A dolly includes a flat, horizontally disposed base supported at its corners by wheels. First and second vertical support walls are mounted to opposite ends of the base in transversely disposed relation to a longitudinal axis of the base. Both support walls have a vertical back edge that extends a first predetermined height and a vertical front edge, parallel to the vertical back edge, that extends to a second predetermined height less than the first predetermined height. Each support wall includes a horizontal step extending a predetermined distance from an uppermost end of the vertical front edge towards the vertical back edge. Each support wall includes a slab-supporting inclined edge that extends from an inboard end of its horizontal step to an uppermost end of its vertical back edge. A single individual rotates a slab from the dolly onto a countertop without lifting the slab from the dolly.