I've never towed with the Durango yet, so I can't compare it to the Suburban, I found out the type of tire makes a big difference..I used to tow a 24 ft. enclosed and with the stock passenger type tires on the Suburban (1500 model) it liked to "wander". Went to a stiffer sidewall and made a noticeably improved difference. With the 17" wheels on the Durango I would expect decent handling, Can someone else comment if they've towed anything with 17" wheels compared to 15"?
Of course, if you went to a 2500 Model it would tow much better...but the ride is a harsher. I had a Dodge V-10 (2500)PU and also the same model with the Cummins diesel and I didn't even know the trailer was back there.