Start with the Dodge Towing Guide
Paste the numbers here of your vehicle; all that are given in the above.
As above, you'll need a WDH, preferably with at least a REESE Dual Cam Sway Control (there are substantially better hitches as well). At least a TEKONSHA P3 brake controller (again, there are better than this as well).
Do a search on a closely comparable trailer to yours this site for actual tongue and axle weights (or acquire otherwise; published numbers by A/S are too low to account for full fresh water, propane and trailer options and normal supplies/equipment short of
camping supplies loaded for a trip); and look up comparable Durango's if to be found.
Step One is to find a certified weight scale and weigh the TV with only driver, full fuel and stuff in truck that is "permanent". This "adjusted empty weight" scale ticket will be crucial to adjusting the hitch rigging for best performance once the TV and TT are loaded for travel.
Step Two is TV tires & shocks. What is on there at present?
Most of all, spend some time reading on here about towing and hitch rigging. It's always a matter of adjusting the hitch for best performance, and scale weights are the crucial difference in final adjustments.