The weight ratings I found and posted were for entirely different 19" BMW wheels, not the Style 99 wheels OP is using. Every wheel is different, but the Style 99 wheels appear to have a lot more material in them than a lot of other BMW wheels.
By your logic, jwest, the stock Land Rover wheels are only rated at a few hundred pounds total more than a loaded LR4.
Further, it stands to reason that the highest loads a wheel faces are not the static or slow-moving variety you describe, but rather a bump at high speeds. If logic rules, putting larger rubber around the wheel should attenuate that force somewhat. That's just armchair stress analysis, though, and it would still be good to know the weight rating for the Style 99 wheels.
What Land Rover requires is somewhat nebulous, however. The load rating on the stock tires that come on the 20" wheels is only around 2,200 pounds. I'm not looking it up, but I'm guessing the load rating on the tires that come with the 22" wheels is even less. A poster on the thread in the first forum I linked above claimed that Land Rover has a minimum load rating requirement of 860kg. Not that I'd rely on that, but I'm curious if that's true.
