I am towing loadedenclosed trailer 6k lbswithout WD without issue. My D' equippedwith 3.55s gear ratio and 4WD
http://www.hemitruckclub.com/durangospec.htm
TRAILER TOWINGa
Engine Axle Ratio GCWRb Maximum Trailer Weightc
2WD
3.7 L V-6 3.92 8600 lbs. (3901 kg) 3700 lbs. (1678kg)
4.7 L V-8 3.55 11000 lbs. (3952 kg) 5900 lbs. (2676kg)
3.92 12500 lbs. (5670 kg) 7400 lbs. (3357kg)
5.7 L V-8 3.55 12500 lbs. (5670 kg) 7400 lbs. (3357kg)
3.92 14000 lbs. (6350 kg) 8950 lbs. (4037 kg)
4WD
4.7 L V-8 3.55 11000 lbs. (3952 kg) 5800 lbs. (2631kg)
3.92 12500 lbs. (5670 kg) 7300 lbs. (3311kg)
5.7 L V-8 3.55 12500 lbs. (5670 kg) 7200 lbs. (3266kg)
3.92 14000 lbs. (6350 kg) 8700 lbs. (3946kg)