We bought two of these units and two of teh 36 X 18 X 72 storage cabinets. Very impressive with the overall fit and finish of all of the units. I agree this should have 4 swivel casters the same as the storage cabinet. My other issue is the weight of the packaging. Two large boxes equals approx. 150 pounds each. It was a lot for my wife and i to move that kind of weight from a pickup truck down into the finished basement workshop by ourselves (we are not getting any younger). This unit should be packed into at least three boxes, even if it meant a slight cost increase. Every one of the holes lined up, the engineering is the best i have seen in a unit of this nature. Thank you for a great product.