we have a 2014 Espy w/tow package and tow a 2015 Jayco Jay Flight 24FBS that was 5240 lbs dry using an equalizer hitch. We loaded it to 6000 lbs last year and drove 8000 miles, mainly in the Rocky Mountains. Our tongue weight was 800 pounds. Sometimes it was loaded up with water as well. I would not want to tow more than what we did, I would think that a 30 ft trailer towed by a short base Expedition would not handle the wind gusts that we encountered on our trip. Hope this helps you, I was in the same quandary as you a year ago and was very pleased at how the Espy performed even in severe conditions.
