The price is primarily driven by the load capacity and the wheel configuration. For heavy-duty industrial use, look for trolleys with a tri-wheel (star-wheel) design made of non-marking TPR or polyurethane, which ensures smooth transitions between steps. The frame material is also critical; aluminum alloy offers a lightweight yet durable solution (ideal for delivery drivers), while reinforced carbon steel is more cost-effective for heavy warehouse loads. Ensure the handle is telescopic or adjustable to provide ergonomic leverage, reducing the risk of operator injury.