I've got a 2005 Expedition Limited with the HD towing package with 85,000 miles. So it's got the 3 valve 5.4, air bag suspension, and rated to tow 8600 pounds. I'm looking at a travel trailer that has a dry weight of 6350lbs, GVWR or 7700, and a hitch weight of 800lbs. I've towed a lot over...