Semitrailer PPRS 39 for transporting working machines and concrete columns for company Bošković from Vinkovci. Useful payload of the semitrailer is 32,1 t. Semitrailer has platform 11.500 mm long. Working height of the platform is app. 950 mm. Platform has aluminum sidewalls. In platform there is two pairs of bulks for transporting pools. Loading of the working machines is with aluminum ramps.