Expedition Max (formerly called the "EL") would be my suggestion as well. Mileage and towing power will be better than the Suburban 2500. You would have less payload available, but in reality, the Suburban 2500's 1,000# hitch limit puts you effectively in the same territory for a travel trailer anyways. You will have to be diligent when you trailer shop, and skip out on the monster full-wall slide or triple slide units. You'll also have to skip out on the high-trim Expeditions, since those 124-way heated cooled butt groping seats are heavy. And you would definitely need the Max-tow option.
BTW - 2015 was the last year for the Suburban 2500. They replaced with a Suburban 3500, which is a one ton, but it only has a 3,000# tow rating.
