Question: Lincoln Navigator is the counterpart to which fullsize Ford SUV?

Context paragraphs:
Lincoln MKT: The Lincoln MKT is a full-size luxury crossover SUV built and marketed by the Ford Motor Company's Lincoln Motor Company division since the 2010 model year.  The MKT (the "T" stands for Touring) was introduced as Lincoln's second crossover in the lineup, slotted above the Lincoln MKX mid-size crossover and below the larger Ford Expedition-based Lincoln Navigator full-size sport utility vehicle.  Sharing a common platform with the Ford Flex, the MKT does not have a direct predecessor.  Instead, the MKT and smaller MKX both serve as replacements of the Lincoln Aviator, as the division moved into the luxury crossover market.

Lincoln Navigator: The Lincoln Navigator is a full-size luxury SUV marketed and sold by the Lincoln brand of Ford Motor Company since the 1998 model year.  Sold primarily in North America, the Navigator is the Lincoln counterpart of the Ford Expedition.  While not the longest vehicle ever sold by the brand (it is shorter than the 1958–1960 Lincolns and the 1969–1979 Lincoln Continentals), it is the heaviest production Lincoln ever built.  Considering its Ford counterpart, it is also the Lincoln with the greatest cargo capacity and the first non-limousine Lincoln to offer seating for more than six people.

Ford Motor Company: The Ford Motor Company (commonly referred to simply as "Ford") is an American multinational automaker headquartered in Dearborn, Michigan, a suburb of Detroit.  It was founded by Henry Ford and incorporated on June 16, 1903.  The company sells automobiles and commercial vehicles under the Ford brand and most luxury cars under the Lincoln brand.  Ford also owns Brazilian SUV manufacturer, Troller, and Australian performance car manufacturer FPV.  In the past, it has also produced tractors and automotive components.  Ford owns an 8% stake in Aston Martin of the United Kingdom, and a 49% stake in Jiangling of China.  It also has a number of joint-ventures, one in China (Changan Ford), one in Taiwan (Ford Lio Ho), one in Thailand (AutoAlliance Thailand), one in Turkey (Ford Otosan), and one in Russia (Ford Sollers).  It is listed on the New York Stock Exchange and is controlled by the Ford family, although they have minority ownership (but majority of the voting power).

Gentherm Incorporated: Gentherm Incorporated, formerly called Amerigon, created the first thermoelectrically heated and cooled seat system for the automotive industry.  Called the "Climate Control Seat" system, it was first adopted by the Ford Motor Company and introduced as an option on the model year 2000 Lincoln Navigator in 1999.  Today it is available on more than 50 vehicles sold by Ford, General Motors, Toyota (Lexus), Kia, Hyundai, Nissan (Infinity), Range Rover and Jaguar Land Rover.

Hyundai Santa Fe: The Hyundai Santa Fe (Korean: 현대 싼타페 ) is a sport utility vehicle (SUV) produced by the South Korean manufacturer Hyundai since 2000.  It is named after the city of Santa Fe, New Mexico, and was introduced for the 2001 model year as Hyundai's first SUV, released at the same time as the Ford Escape and Pontiac Aztek.  The Santa Fe was a milestone in the company's restructuring program of the late 1990s because, despite receiving criticism from journalists for its obscure looks, the SUV was a hit with American buyers.  The SUV was so popular that at times, Hyundai had trouble supplying the demand.  The Santa Fe quickly became Hyundai's best seller and contributed to Hyundai's success in the United States.  As of 2007, the Santa Fe falls between the slightly smaller compact crossover Tucson and the larger, yet related luxury crossover SUV Veracruz (which replaced the Terracan).

Ford Thunderbird (sixth generation): The sixth generation of the Ford Thunderbird is a large personal luxury coupe that was produced by Ford for the 1972 to 1976 model years.  A counterpart of the Lincoln Continental Mark IV, this generation of the Thunderbird was the largest ever produced; weighing in at over 5000 lb , they are also the heaviest coupes ever produced by Ford (aside from its Mark IV counterpart).

Ford Expedition: The Ford Expedition is a fullsize SUV that is made by Ford Motor Company.  Introduced for the 1997 model year as the successor of the Ford Bronco, the Expedition is the first full-size Ford SUV sold with a four-door body.  For its entire production life, the Ford Expedition has been derived from the corresponding generation of the Ford F-150 in production, sharing body and mechanical components.  Currently in its third model generation, a fourth-generation Ford Expedition is slated to enter production for the 2018 model year.  Similar to the configuration of the Chevrolet Tahoe and Suburban, the Ford Expedition is sold in regular and extended lengths (the Ford Expedition EL/Max); sold since 2007, the latter functionally serves as the replacement for the Ford Excursion.

Mercedes-Benz GL-Class: The Mercedes-Benz GLS-Class is a Fullsize luxury crossover SUV produced by the German carmaker Mercedes-Benz since 2006.  It is a three-row, seven-passenger vehicle positioned above the GLE-Class in the lineup and is the flagship of the Mercedes-Benz SUV line.  The GLS shares the same unibody architecture with the GLE-Class.  The vast majority of GLS-Class vehicles are assembled at Mercedes-Benz US International, Inc, in Tuscaloosa County, Alabama except for a small number of early production 2007 model vehicles which were manufactured in Germany.  The first generation (X164) was manufactured between 2006 and 2012 and was replaced in 2012 by the new generation GL-Class (X166).

Cadillac Escalade: The Cadillac Escalade is a full-size luxury SUV engineered and manufactured by Cadillac.  It was Cadillac's first major entry into the popular SUV market.  The Escalade was introduced for the 1999 model year in response to German and Japanese competitors and to Ford's 1998 release of the Lincoln Navigator.  The Escalade project went into production only ten months after it was approved.  The Escalade is built in Arlington, Texas.  The word "escalade" refers to a siege warfare tactic of scaling defensive walls or ramparts with the aid of ladders or siege towers.

Ford Explorer: The Ford Explorer is a full-size sport utility vehicle produced by the American manufacturer Ford Motor Company since 1990, based since 2010 on a crossover platform.  The Ford Explorer became one of the most popular sport utility vehicles on the road.  The model years 1991 through 2010 were traditional body-on-frame, mid-size SUVs. For the 2011 model year, Ford moved the Explorer to a more modern unibody, full-size crossover SUV platform, the same Volvo-derived platform the Ford Flex and Ford Taurus use although with significantly greater ground clearance.  It is slotted between the traditional body-on-frame, full-size Ford Expedition and the mid-size CUV (Crossover Utility Vehicle) Ford Edge.  Although outwardly similar, the fifth generation Explorer, Ford Edge and Ford Escape do not share platforms.  The fifth generation Explorer does, however, share platforms with the Ford Flex and Lincoln MKT.

Supporting paragraphs: Lincoln Navigator Ford Expedition
Answer: Ford Expedition