If you want specific answers to your question we need your Durango's max payload, GVWR and actual curb weight. Towing capacity does not reflect what you can tow in a travel trailer. You will run out of payload way before you get anywhere near that towing capacity. Attempting to tow a 32' TT with the short wheelbase of a Durango is another problem. Without the specific numbers I mentioned I suspect you will be limited to a trailer of no more than 5,000# GVWR and you may rest assured it will be nowhere near 32'. Good luck.
:C