Now I'm a stickler on tried and true but some of the products shown changed my mind a little bit and I could definitely see them being implemented very well potentially to the us market. The trailer powered axle is cool. But how much does it add to the net weight of the truck overall? It might "save" money on fuel,but how much does it detract from your gross weight? The payload? The hook on road maintainer is awesome. The steering seems a little wonky,but I'm sure you'd get used to it pretty quick! I like it!
1: will need to be recharged periodically like an electric car. Regen braking cannot return 100% of power used
2: or instead of the very complex thing there that is definitely not compact, you could just have a grader or, get this, a bucket loader
3: unit adds unnecessary flex to the frame of the truck. Unit will need to be tuned and adjusted to fit any and all trucks so it doesn't fight the diesel engine (there is a reason you do not ever see two separare drive systems in one vehicle working at the same time)
4: or you could just maintain your truck better
5: or you could buy an existing railcar mover like Trackmobile or Shuttlewagon, both of which will vastly out perform a Unimog or tractor with a toy coupler on it. Also, that tech isn't new, people have been using tractors to move railcars for over an actual century, if not longer