This is the default New Holland T8 tractor with the wide wheels setup removed and two dual (twin) wheel setups added. The first two wheel setups are the default standard and wheel weights options, and have not been changed. The third wheel setup (Rear twin wheels) has dual wheels on the rear and single wheels on the front. The fourth wheel setup (Twin wheels) has dual wheels front and rear. The last setup is the crawler track option and has not been changed.
Place the zip file(NewHollandT8_Duals.zip) in the Farming Simulator 2017 mods folder. When starting the game on the MODS/DLC page enable New Holland T8 Duals by checking in the circle on the line for thatmod. The mod will be in the tractor category of the store to the right, after all of the default tractors. Select it and then select the desired wheel setup under Options & Upgrades.