I towed our 5,000lb hybrid for 10 years with a 2004 5.7L Durango. Pulled it very well. That said I'm not sure about the newer Durangos. The 2004-2010's use are built on a truck type chassis with fully formed square tube frame that is very solid, no flex. They also use solid live axles front and rear which in my opinion results in superior handling when towing. The new Durango's have a D channel frame and independent suspension. Makes for a great comfy smooth ride but I would think would reduce handling when loaded down.
