Kermit said:
First of all, the car manufacturers lie about the towing capacity.
I'm sure that they don't, especially since the warranties would cover engine damage as long as you are towing within your capacity. The people you have to be careful with are the RV sales people. They will tell you your vehicle can pull whatever they are trying to sell. When we were looking for a new trailer, one guy tried to talk us into a 25' hard side with full kitchen cabinets and TWO tip outs. Dry weight was 4800 lbs! He swore black and blue that our '97 Patfinder (towing capacity 5000 LBS ) could pull it. We just

and

! However, you have to stay well below the "dry weight" capacity, because, as others have mentioned, you have to factor in the hitch, and all your belongings as well. Also, the weight shown on the side of the trailer usually doesn't include the "options", it is for the base model. If the one you buy has an airconditioner, microwave, etc you have to factor that in.
We had a 2002 Damon Camplite (pop-up) with a dining room tip out. It was about 2500 lbs dry. Our friends both have pop-ups, one has a Venture with a cassette toilet that they pull with a Caravan, and the other has a Starcraft with a tip out, also pull with a Caravan. You might be able to get a 16' or 18' expandable that is light enough for the van to pull. We now have a 23' Palimino expandable with a dry weight of 3300 lbs. (not including the options) We had to buy a new vehicle to pull it, because loaded, it was just to close to the towing limit on our Pathfinder and we felt the engine was struggling when we used it last year. Check out the Palimino or Trail Lite websites, you might find something.