Mercedes-Benz G63 AMG vs. G63 AMG 6×6

The 9,000+ pound, $575,000+ Mercedes-Benz G63 AMG 6×6 is a totally over-the-the top ride clearly designed for rich oil barons in the deserts of the Middle East. But is it really worth the $400,000 premium over and above the already impressive G63 AMG 4×4?
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