Because of all the other tonner bits that would be needed too, which would include a Salisbury rear axle on 6cyl vehicles. Plus a special tailshaft with 1.125"unis front and rear.
I don't think you could get F72 outside of the XW5 "Outback Equipment Package" either, and it didn't increase the GVW of the vehicle otherwise all the other tonner bits would be needed as well. As far as i'm aware the F72 springs were for a constant load increase eg a canopy on a ute or permanent toolboxes or racks in a van.






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