What car functionally serves as the replacement to the longest and heaviest SUV to ever enter mass production?
Ford Expedition:  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. Ford Excursion:  The longest and heaviest SUV ever to enter mass production, the Excursion was based upon the Ford F-250 Super Duty pickup truck.
Ford Expedition