I have a 1998 Expedition with the same specs as yours, except much older. It has an 8000 lb tow rating. I have a 2001 Excursion with the 7.3 diesel, with an 11000 lb tow rating. My TT comes in at about 8000 lbs (dry weight is just over 6000 lbs).
I have not towed the TT with the Expedition, but I know the Excursion definitely feels the load, especially when going into the mountains. I would be fine towing with either one on flat land. But, if going into the mountains, I would think the Expedition would really struggle going up hill. It would not be an enjoyable trip.
I hope that helps.
