Check out the Panzer 1 turret on top to get some scale of the thing.
It's the Alkett Minenraumer, one of those German vehicles that had a kind of semi-legendry status until Kubinka opened up to the West with perestroika. It caused quite a few ripples throughout the 90's armour-nerd world alongside the revelation of a surviving Maus, Sturer Emil, Morser-gerat etc.
It looks even more peculiar from behind but gives a better idea of the sort of path it was intended to clear:
There was a Krupp prototype along
similar lines in the Form of the articulated Schweres Minenraumfahrzeug but details are even sketchier on this:
Cheers,
Adam.