seems the dual load idea has been out for sometime, not sure how well it works for the long term on a solid axle.
I assume is was designed for the load to be carried on the lower ball joint like it currently does but maybe ball joints wouldn't wear out as fast with larger tires if the load was distributed..
Personally I'm not willing to pay that amount for an item that has not real long term data on it. It's easy to claim anything with marketing.