Suspension limits and parameters were set only approximately so the behavior may not be precise. But it's normal that an unloaded Tatra truck has its hind wheels in V shape.
Also the dynamically refined terrain has a higher resolution than the mesh used for physics, that may be slightly visible in closeups.
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As a technical note, both videos were captured using GPU-based compression of video frames to reduce the bandwidth needed for sustained disk writes, while not imposing a noticeable performance penalty. Since the video frames are being compressed on GPU, GPU->CPU transfers are also smaller what is a good thing as well.
I also made a custom video codec for ffmpeg that can decode these videos so one can recompress the video directly with ffmpeg or any other tool that uses the libavcodec dll. There will be a separate blog entry with more technical description and the code to be usable for others.
Are you accurately simulating the differential(s) on the axles? It seems like it's going too straight for the diffs to be binding up on the hills, unless you just assume that they're in locked diff mode all the time.
It does look like a hoot, though. I wanna drive that truck.