Graduation thesis is presenting forestry trailers, listed are some of the biggest manufacturers of forestry trailers in Slovenia and Europe, and some models of forestry trailers and their technical characteristics. Forestry trailer Farma, with load capacity of 12 t and with the crane C6-5D in combination with the tractor Valtra N92 was used for field measurements. Measurements were made in 10 cycles, in which time between different operations was measured. Calculations were made, how much wood was transported/harvested, and analysis of data that was obtained with measurements. Main productive time was identified in dependence with skidding distance/transportation distance. Also auxiliary productive time was identified in dependence with the size of load. Calculations were made on possible effectivnes with regard to size of load, harvesting and transportation distance. Calculations of economics of forestry trailer in combination with tractor used in field measurements were made, forestry trailer with tractor was compared with truck transportation and comparison amongst the tractor and truck transportation is identified.
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