could be wrong, but I am guessing the wt of the turtle body could be the issue. Could also be that no one has asked for that combination. I bet that if someone came in and asked Mike and Rene' to make it, they would try to make it work. I don't know the gvwr for fuso, but I believe the turtle on the ford f550 is pretty close to its limit. Otherwise, I agree , it would make a really nice rig. Too bad fuso doesn't have a 4x4 in the class 5-6 range in the usa with the power of the mog u500. I was at GXV and looked at the used fuso. It was a nice set up. Just not enough power to tow much , which I need. Also, the cab to cabin access is pretty small on the fuso compared to the ford/turtle combo.