Used on the trailer PRONAR T683U replaceable micro-rubber seals, fixed on the upper, side and the back frame, makes it ideal for the transport of the bulk products of small grain size, such as for example rape. Therefore, the central pillars and the rear connections between the walls and extensions are fitted with EPDM seals, which addictionally increase the tightness of the trailer. Suspension element have been selected so as to make maneuvering with the trailer easy and ensure their high stability. Permissible total weight of 20 tones is the size at which are included in the optimal way both economic aspects (price of the trailer and its low costs of ownership) and utility (optimal load capacity and cargo capacity, functionality, reliability and durability).