How much can you put on the roof of a famous modern map?

The standard of roof is about 1.3 tons. The roofs of modern famous maps are used for ventilation and shelter, and no heavy objects can be placed. The skylight is installed on the roof, which can effectively circulate the air inside the car and increase the intake of fresh air. At the same time, the window can also broaden the horizon and meet the shooting needs of mobile phone photography.