Lincoln calls the Navigator “America’s original full-size luxury SUV,” and when it debuted in 1998, it owned its segment. Then the Cadillac Escalade came along. The Navigator’s second-generation revamp in 2003 made it better in almost every way, thanks to sharing its platform with the Ford Expedition and F-Series trucks, but features such as power retractable running boards and a power lift gate couldn’t help it compete against the in-your-face Escalade. For its third generation, the Navigator is still based on the Expedition, but it pumps up the attitude and adds a stretched L version to help it square off against its GM rival.