The entire underbody system, including the rear wheel arches, is coated with a layer of PVC to protect against corrosion. Particularly dangerous areas in the area of rotation of the front wheels are protected against crushed stone by plastic covers. In addition, body parts subject to corrosion are made of high-strength or galvanized sheet metal. Before the onset of the cold season and after washing the bottom of the body, check its anti-corrosion protection and, if necessary, carry out additional preservation. Dust, clay and sand can be deposited in the centrifugal area of the body base. Of particular importance is the removal of accumulated dirt, which in winter can also be enriched with salt.