I needed the three rows of seating so we purchased an Expedition. Worked OK for a 4,400 lb. trailer. When I went with a 7,300 lbs. trailer with 950 lb. tongue weight, it was just too much for the Expy. Way too wiggly in the rear end of the vehicle for my comfort level. My Expy's limits were 895 lb. tongue weight and 8,950 lb. trailer weight so, in theory, it should have worked.
Biggest thing (IMO) is to verify that the actual tongue weight & actual trailer weight (not what's in the brochure) are well under the Navigator's limits.
