Gamera
what were the German engineers smoking!?!?!
Given that there are some ideal W x L proportions for tracked vehicles (too long and can't turn, too short and won't go straight) there's only a limited space for roadwheels long a given hull side.
Now, the diameter of the torsion suspension arms is proportionate to the load, from/to the tracks. So, more arms can be smaller diameter, which means more room inside the hull, over/next to the suspension.
So, that leaves over-lapping the wheel arcs.
Now, that also has some benefits, as the overlapped wheels can be "skinnier" with smaller contact patches (to the limits of permissible ground pressure between the wheels and tracks). This can be handy if the tyres you are using on the roadwheels use strategically-limited materials like rubber. Or the steel in the wheels themselves
Also handy in that the spacing of the interleaved roadwheels can better spread the load across really wide tracks. Which lets you have, say, 10cm tyres to roll on 60cm track.
There's also some compromise available in that having a broken suspension bar can be more "tollerable" with interleaved wheels.
The engineering makes sense. The extra work for the tankers, maybe not so much.