I pull about 6600 lbs with my old Suburban 5.3 (Elouise). Have been on a few trips. It does pretty well, even to dog shows with 5 dogs. I added the Sumosupersprings and they are worth their weight in gold. Of course you are considerably heavier but, the newer burbs have more power so, it all balances out. There is a torture test video on youtube that compares the suburban and the Expedition. They liked them both. The Expedition did better towing uphill, the suburban downhill. But, they were closely matched. I'd have either one.
Here's one. I cant find the uphill tow video but, I'll keep looking.
https://www.youtube.com/watch?v=zK-B7V25heg