Dodge body builder guide
http://www.rambodybuilder.com/2005sbbgl/docs/hb/mlup.pdf shows the Durango has a 7150 lb tow rating with the 3.55 axle and a 8150 lb tow rating with the the 3.92 axle. Both show a 1400 lb payload.
Keep in mind tow ratings are for all types of trailers. As mentioned a 32' TT will have lots of tail wag for that small Durango especially at those kind of weights.
I also don't think you will like the towing performance or handling issues from that small vehicle. I would look at 24'-26' TTs at say 5500-6000 lb wet weights at max for the Durango.