We just have a difference in our opinions. As I stated in my first post,"IMHO" - In my humble opinion....it was the Hankooks that were on my Navigator that caused the rough ride. I had Michelins put on my Navigator this past weekend and the ride is significantly better. The Navigator is driven mainly by my wife and she complained about the ride a couple of weeks after we took delivery. I drive it some on the weekends and I agreed with her. My daily ride is a 2019 Lexus ES with Michelins and it rides great. My fun car is a Dodge Charger Hellcat widebody with 20" rims and low profile, wide Pirelli P-Zero tires that ride rough....but I expected that when I bought it. I didn't expect the Navigator to ride as rough as it did....but it doesn't anymore since I changed the tires.
To answer the other question about driving the Navigator on cement highways at higher speeds....yes I did and the ride was just a little better, but still not what I expected from a near $100K vehicle. I have already driven it on the same highway with the Michelins and the ride is better....IMHO. My wife is now satisfied and that's all I care about. I only wanted the Navigator with the trailer tow option so I could pull my boat. My wife couldn't have cared less about the utility purpose of Navigator.
I think this post has run it's course.