Four PK PPSM39 forestry semi-trailers have been delivered to UPTO Benšak. These are floorless semi-trailers designed for log transport, with a usable platform length of 13000 x 2333 mm. Each semi-trailer is equipped with six pairs of ExTe E144 bunks. The empty weight of the semi-trailer is 5200 kg, providing a payload capacity of 30800 kg.