The invention relates to a bunk of a load space which bunk (12) includes a frame component (15), a support component (14) articulated to at least one end of the frame component (15), and two bunk arms (16, 17). At least one bunk arm (17) is composed of two or more plates (18, 19, 20) wherein one of the plates (18) is profiled to a curved form (10) on the transverse plane at the position of the load space and the other plate (20) is made parallel to the curved surface of the bunk arm (17) for widening the surface area of the bunk arm (17).