Not quite the same boat, but my standard rims have a sh*t load of weights as well. They are all opposite the valve stem, so it may have something to do with the tire pressure monitoring system. Kind of strange when I first noticed it though...
My fuel D551 wheels with my 35's are the same, and they are only cosmetic bead locks. The tire and its size, make, etc, also have a lot to do with it as it was explained to me.
I believe it is because of the tires. There should be a small yellow dot on the tire which indicate the heaviest spot. That dot should be mounted opposite from the valve stem and any other additional weight added to the tire. But maybe not in automobiles like we do with motorcycles. Those Balancing weights should be opposite of the dot.
or I may be full of crap.