This truck is based on the 8110 lego kit, which I modified quite a lot to also include motor sound.
About this creation
Besides mounting a PF XL motor, a PF servo for steering, and 4 PF lights, I replaced most of the colored parts, tyres, changed some design elements to get closer to the real unimog shape. I also added a diesel motor sound-system based on the former Lego Code Pilot which gives a quite realistic sound from idle to full speed. This motor sound can be started remotely (PF-based).