Not sure what motor you have in your caravan but the 2002 towing guide (here
) indicates up to 3800 lbs with a V6 motor and the towing package (3500 lbs if 4WD). That is the only listing for a Caravan (no 4 cylinders). You can also check the door jamb of your vehicle. It should list the towing rating of that particular vehicle. You are looking for things like GCWR, GVWR and Axle Ratings.
Of course you will need the tranny and oil coolers. You may want to check what else comes with that towing package. Some also include a power steering fluid cooler.
Most pop-up manufacturers make units starting roughly around 1000 lbs. up to 3500 lbs. To name a few, Starcraft, Coleman, Rockwood and Jayco.
This is the time of year when the RV shows are starting up. I suggest you go to a few shows and see what is out there and what is available in your weight range.