I am looking for a solution to replace these front axles on a second version I am building of this Actros, with two straight axles.
And if you look on www.brickforge.de you can find the LDraw files and submodel files on this site.
If you take the submodel of the Actros front, you can see how the submodels are added and how the chassis is build before the front axles are build in.
It has independent front suspension, but it should have straight axles with a kind of leafspring or something like the Unimog from 8110 has, but without the drivetrain. Haven't figured out yet how do do this.