Our family of 6 rented a Salem 31ft trailer that has a 7100 dry weight and drove it on a 1500 mile, 10-day trip. Our 2015 Expedition EL Limited pulled it just fine. The power situation was much better than the 2001 F250 7.3 diesel it replaced. I felt the diesel was constantly struggling to pull this trailer whereas the Expedition seemed to have oodles of extra power and rarely had to downshift. Although we did not do any mountain driving I am sure it would handle that just fine. The builtin trans temp gauge never really budged from around 200 degrees. My F250 had a 178" wheelbase (vs 131 for Expedition EL) and 19.5" heavy duty tires so comparatively the Expedition feels less stable but it never felt unsafe. Of course I had a WD hitch and the Reese anti-sway control device. The family is way happier riding in the Expedition vs the F250 and that makes a big difference on long trips. All in all I am very happy with the Expedition as a tow vehicle but as I consider purchasing a trailer I will likely try to keep the length under 30' and GVWR < 8000 lbs so I have plenty of safety margin.