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It's not "rolling resistance", but tire/while radius from the hub to the contact patch, and the number of revolutions per distance. I don't know what the viscous couplers will tolerate nor for how long. You want to have one size tire all around on the DSM's AWD setup. Differing radii, regardless the amount, will cause more stress than matching ones.
I know of no other AWD setup that is like the DSM's. Most have some kind of mechanical or electronic fudge between the ends, or split the torque output between them. DSMs are built to go 50/50 until something slips and shows a difference in the front and rear axles, and then the driveline tries to go solid through the VCs; this is why they can't be towed with one end on the ground.
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