I have the truck and camper in the signature below and tow a JK which I recently weighed at 4400 lbs. My truck tows the load down the road just fine, you hardly know the jeep is there. I've towed this configuration for about 10,000 miles now and have not had any issues. I do use a supplemental brake system which I feel was a real benefit on one sudden stop. Generally I leave a lot of distance between myself and the vehicle ahead and slow for stops or corners very early. I think my camper weighs in at about 4000 lbs. loaded.
Brian