Amazon.com: Mount-It! Stair Climbing Dolly - 3 Wheel Stair Climbing Cart | Easily Lift Heavy Items Up and Down Steps | Holds 330 Pounds and Smoothly Rolls on Variety of Surfaces -
Mount-It! Stair Climber Hand Truck and Dolly, 330 Lb Capacity Heavy-Duty Trolley Cart with Telescoping Handle and Rubber Wheels - Amazon.com
M1 Stair Walking Box Dolly » Dolly Innovations
3 In 1 Aluminum Hand Truck Dolly 1000lbs Stair Climbing Cart Folding Trolley 832419274761 | eBay