No knowledge of a Navigator but it is the same basically as an Expedition. I had a 1997 Expedition for 19 years and pulled my 7000 lb boat thousands of miles and then a 2014 Keystone Bullet TT for 2 years that weighed 6000. It performed beautifully on both trailers and was the most dependable vehicle I ever owned. Last summer I traded in the 97 with 216,000 miles on it for a like "new" 2013 Expedition with 54000 miles. Have already towed my Bullet 3000 miles with it and it is a great TV! Get a good WD hitch to spread the weight that is anti sway ( I have an Equalizer E2 and love it! your weight limit on the TT would probably not exceed 7000 and a tongue weight of 700-800. The nice thing is that an Expedition or Navigator are great family vehicles when not towing with a great ride and room for 8 passengers.. can't get that from a pickup!