Fig. 76. Tracked suspension.
1-drive wheel, 2-track, 3-road wheels, 4-road wheel balancers, 5-shock absorber, 6-long lever, 7-short lever, 8-main support carriers, 9-idler, 10-track tightening mechanism, 11-return idlers
Interestingly enough, in factory documentation, this suspension is called "Krupp Suspension". Why?
As you can see here, elements of the suspension are quite similar to Krupp's Grosstraktor.
And yes, those are propellers you see in the rear. The Grosstraktor was amphibious.