The Mercedes G550 is an unlikely niche vehicle. As with perhaps every other military-derived civilian 4×4, it’s a box on wheels, all straight lines and fender flares. Yet unlike most other military-derived civilian off-roaders, it comes standard with solid axles front and rear, three electronically locking differentials front, center, and rear, and, get this, heated rear seats. Celebs, trendsters, and the generally rich keep it in the public consciousness. When Mercedes decided to kill it, a general uproar caused them to belay the order. It costs $100,250, and has no options. Before we drove it, we didn’t know why people dug it. Yet after a week with it in the Autoblog Garage, we think we know why: it is colossally fun.