Two years ago a Mercedes Trucks dealership in Spain asked me about built a Arocs 8x8 for them in big scale. When I had the chassis finished they decide don't buy me the truck, so I stopped the development, but I kept the chassis assembled because I didn't need the parts for other projects.
This is what I built (the chassis has tons of dust... but after two years on a shelf is normal ;) )
The overall chassis size is 29 studs wide and 90 studs of length.
They are like the real Arocs, solid axles with leaf springs, disc brakes(yes, the real Arcos can have disc brakes in the front), complete ackerman steering with linkage mechanism.
The second axle includes two differentials: the second axle differential itself like another axle, and the central differential between the first and second axle. Just like the real Arocs.
6L engine. Now the truck has some parts missing, but after 2 years I have needed some of them to other proyects.
Here you can see the complete steering linkage system. The little linear actuator move the steering of both axles.
Again they have the same design as the real Arocs rear axles.
The third axle includes two differentials similar to the second one: the third axle differential itself and the central-rear differential.
The axles have 3-link suspension, again like the real Arocs, common leaf springs and drum brakes.
I am publishing this because probably I will never finish this truck, and now with so many people talking about the MB Arocs I think it is a good moment to show it. ;)