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Dunno about MB specifically, but on our SUV the GVW is different front-to-rear. I ran some numbers for it and, taking into account the contact patch needed to support that weight at that pressure, the front and rear ended up having the identical rolling radius. My calcs certainly are not correct since I'm no tire expert, but they were enough to convince me of why they make such specs.
Also, even a degree of more or less forward tilt alters the geometery enough to change the handling and steering of a vehicle.
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