Roof for truck or trailer provided with a loading space which can be loaded from above

The roof (2) is for a truck or trailer with a load cavity (1) fillable from above. The roof has guides (3) at front and rear, which act with counter-guides (4) fitted to the upper edge of the load cavity. There is an arm (6) on either side, which is pivoted at one end to the rood and at the other to the top of the load cavity.