Nice photo, I work with these in the transport planning field, usually figuring out how to get these from Port to site. The longest so far that I have "driven is a 50m blade, a challenge when some of our roads are tree lined and only 5m wide in places.
Those big blades sit atop 120m towers
That one looks to be in a clamp and there would be a boom between either set of wheels, the rear wheels being steerable to make turning easier. I never tire of seeing these .
Cheers