Abstract: Guide track made up of two wide wing I-shape profiles oriented in parallel and separated by a distance of 500 mm. Central rolling guide box, a set of four vertical axis wheels located at the ends of two steel bars intersecting and forming a cross-shaped device. The assembly is located between two steel plates measuring 700×400×25 mm, forming a box from which the guide wheels protrude laterally to rest tangentially on the web of the guide track profiles. Pivoting anchor cylinder with a dual function: anchoring of the box below the vehicle and transmission of box rotation for orientation of the support wheels.