Forget about the weight of the trailer. It's meaningless. Theoretically, a 2500 Burb could easily pull a 15,000-lb trailer.
All you care about is the weight on the four wheels of your tow vehicle. 2500 Burbs, regardless of the year, are 8600-lb GVWR vehicles. Payload is right around 2000 lbs. Take away 700 lbs for your family, that leaves you with 1300 lbs of tongue weight. Is the trailer tongue weight higher or lower than 1300 lbs?
FYI - the Excursion is a great vehicle, too. However, the diesels have much heavier engines, and actually have a lower payload rating than the 2500 Suburbans. I love the concept of a DuraBurb, but you take a big hit on payload, so, to me, it kinda defeats the purpose of the diesel upgrade.
On my last trip with my family of 5, we were at 8460 on GVW. And that's with a ~900-lb tongue. Not much payload left.
For a monster trailer like that, a 1-ton van is your only option.
