I know the old owner of that U1000 in the video. He was the first person ever to take me around an off road site in a Unimog - that Unimog! Tom was his name, a chap with lots of interest in everything unusual. I think he sold the Unimog and bought an old American Chevy pickup when he got bored of off roading.
It's a shame he tied it to that tree. I'm pretty sure it would have made it down there fine without the hindrance of that winch line pulling him over.