For decades, Jeep purpose-built the CJ and its successor, the Wrangler, for off-road duty; this meant a stubby wheelbase and two removable doors. That changed in 2007 when Jeep added the Unlimited to a freshly redesigned lineup.
With its extra set of doors, expanded cargo area and longer body, the Wrangler Unlimited became a credible passenger vehicle, even if purists dismissed it as too civilized. But the idea caught on and vastly expanded the Wrangler's appeal. Line sales have been brisk recently, prompting Jeep to add production capacity to meet demand—a problem a lot of automakers would love to have.