I don't understand how anyone can recommend an Excursion these days. The newest one is almost 12 years old (2017's are shipping), and most of them are getting long in the tooth. Sure there are a few still around that were only driven to church on Sundays by little old ladies, but those are rarer than hen's teeth. You could spend years looking for one. If you want to tow this summer, you'd almost certainly have to settle for some clapped-out clunker.
Also not getting the size thing. A full size SUV is a full size SUV. The difference between an Expedition and an Excursion is mostly in suspension and drivetrain. In overall size they're not much different.
Frankly with your trailer an Expedition is borerline, but doable as long as you aren't a traveling leadsmith on the craft show circuit this summer.
Putting 10-ply tires on half ton trucks since aught-four.