Automated steering by Lego PF servo's
There are 4 servo's used in this trailer but the trailer also works with 2 of them.
Also the tires could be changed to the new ones (15413 and 56145)
Mercedes-Benz Actros 4160 SLT is not included in this partlist
Use this partlist for the Actros: http://rebrickable.com/mocs/jaaptechnic/mercedes-benz-actros-4160-slt-mammoet
More information on my website