Hi,
Be aware that this railway truck has different axles. At least the rear axle is a high capacity one with leaf springs instead of coil. also no portal! For offroad not the best guess.
speed is 70km/hr on road, 50km/hour on the track.
dutch a-like rail-mog with specs
Must be such one for sale somewere in the dutch also. It was this winter i saw it in some ads.