Heavy Duty Convertible Stair Climbing Hand Truck Cart DollyHeavy Duty Convertible Stair Climbing Hand Truck Cart Dolly Carrying large and heavy items up the stairs is never an easy task, especially if you do it all on your own. With the assistance of our heavy duty hand cart, transporting multiple items at once is a breeze. Equipped with a spacious base, the hand truck dolly provides great support to the items that its carrying. Plus, this convertible hand truck can carry up to 330 pounds of items in one go.