Real G
I think the tandem tracks were meant to allow the tank to limp off the battlefield if one of the tracks got hit.
Probably a "dodge" around the length-to-witdth ratio envelope all tracked vehicles have.
There's a ratio to where the tracks get longer than width, and you simply cannot turn. The moment arm to get the yardstick to change course is just too huge.
The same ration also 'drives' how wide a track shoe can be--over a certain width, the bogies will just slide off the track.
The real issue is in having twice the labor required for monitoring track tension.
As a guess on this beastie, the shorter front tracks are geared differently to provide more steering force than the rear, main, tracks. Which sounds like a nightmare for transmission maintenance, and for coping with steering linkages.
Kind of spoils the engineering elegance of the thing of needing a truck load of mechanics to follow your track around to keep it running.
That's one of the limiting factors of Bolos and Bun-Bun--track maintenance