sleeoffroad
Supporting Vendor
That's because they're not designed for the weight of the 80.
Not sure where you got that info. The only reason they don't list it is because the 80 uses hubcentric wheels / hub and it is not possible to make a hub centric spacer for the 80 full floater setup. Well, one could for the front but not the rear.
It does not have to do with the weight of the vehicle.