Hmmm. Look again. That can't be the GVWR, which is the maximum weight of the van and passengers and cargo. The van itself must weigh more than 2500 lbs. 2500 sounds more like the maximum carrying capacity of the van, i.e. the most passengers and gear you can put onboard.
Now you have a really useful datum. Get your van weighed, with a full tank of fuel and whatever passengers you would normally have when camping. Subtract that actual weight from the 6600 and that is the maximum trailer weight you could ever tow. I would back off from that about 10% and shop for a trailer with a GVWR of that size. That's GVWR, not dry weight. The only other thing to be cautious of is the weight on the hitch (called trailer tongue weight). Tongue weight is usually about 15% of the actual trailer weight and your van and hitch will have a max limit that must be obeyed. That's where a weight distributing hitch helps - it spreads the tongue weight over both front and rear axles on the van.
