We have a newer style WA600 like that one at work, and it will damn near reach across an EH1000 box. The new 600s took a bit of a jump size wise having quite a bit more reach. You can watch him in the video pushing the material across the box to center the load, and that truck left the loader with room for at least two more buckets on board, so I would say it's a 100 ton truck with no hesitation. I would assume they were using the smaller loader to fill in while a larger machine was down for repair or service.