I love my 2500 Suburban with the 8.1L, it would tow that trailer like it was hardly there. It tows my larger trailer quite well. With that said, an Expetition EL with the factory tow package would also tow it quite well. Non-towing fuel economy and a newer vehicle are benefits of the Expedition.
I used to tow a 26' 5600 lb loaded trailer with my '96 Buick Roadmaster Wagon. We went thousands of miles with it and it did fine and it isn't nearly the tow vehicle the Expedition is. Good hitch, good set-up, appropriate tires, etc. It will do really well.