Every year I need to get a window AC from the basement to the 2nd floor. As my back aged, carrying it up became impossible, and so used a standard two-wheeler, thumping up each step. Still a lot of back stress hauling it up each step, so wife stepped in to help lift it up. Had read about these step-climbing 2 wheelers and decided to give it a try. The 40 lb AC easily fit on this hand truck and the supplied bungee cord secured it. It fairly easily went from step to step; my wife no longer needed to help and my back was happy all the way to the 2nd floor. Great product! Seems sturdy, and folded easily for storage.