Looks to me that was the way to have tightly spaced big wheels. Big wheels should mean a smoother ride than with smaller wheels, and probably less strain on the tracks.
At the end of the day, going with the simple suspension and wheel layout, like it was the case on the Pz-III and Pz-38(t) should also give good results, while not having propensity to clog mud snow between the wheels. The Soviet KV and IS tanks used the Pz-III style torsion bar suspension and small wheels, worked just fine. The US designs also used it, at M-18 and Pershing, though with bigger wheels.