I think a full size van would be your best option - either the Chevy or the Ford. That will have the best tow rating, and the most interior room. Much more than a Burb or Expedition.
As far as the suggestion to caravan out, I would think long and hard about that. When we go camping, we often do it at a lake, and take the boat. Short version of the story is that my wife and I caravan out - she pulls the RV with the truck, and I pull the boat with a Yukon XL. Neither of us are in love with this way to travel. Seems very inefficient, and makes a three hour trip seem a lot longer. Not to mention what it would feel like on a 1000 mile journey.
