Which method should be used to re-supply a permanent customer fuel storage facility located on a rooftop?

Using a freight elevator to re-supply a permanent customer fuel storage facility located on a rooftop is the safest and most efficient method. Freight elevators are specifically designed to transport heavy materials and equipment, making them ideal for moving propane or fuel storage tanks. These elevators are built to accommodate the weight and ensure that the transport of materials complies with safety regulations. Additionally, utilizing a freight elevator minimizes the risk of accidents that could occur when using alternative methods like ladders or manual hoists, which may be less stable or secure. This approach ensures a smooth and compliant operation, providing peace of mind for both the operator and the customer.