Abstract: A semi-trailer for automotive vehicle transportation of the type whose front is coupled to a tractor (T) and whose rear rests over at least one wheel train shaft, including a substantially parallelepiped basic structure (10, 110), incorporating a front cargo platform (20, 120), a rear cargo platform (30, 130), and including at least one lower cargo platform (40, 140) and at least one upper cargo platform (50, 150) whose position can be vertically adjusted. The upper longitudinal edges of the basic structure (10, 110) has longitudinal support bars (11, 111) and the corners of the basic structure (10, 110) have front vertical columns (12, 112) and rear vertical columns (13, 113). A remount system (190) is articulately suspended between longitudinal support bars (111) of basic structure (110) by support pendula (192) and articulately attached to the longitudinal support bars (111) by positioning arms (193) in order to be longitudinally and vertically displaceable along basic structure (110).