bhvrdr:
Welcome to the forum, and congrats on your new to you Durango. Does your Citadel have the 3.6L, or 5.7L?
Both are good engines, and do an excellent job of motivating the Durangos heft. The 8 speed trans is the icing on the cake.
bhvrdr:
Use this link, and insert your VIN at the end of it. It will tell you the options that your D rolled out of the factory with. You are looking for "TRAILER TOW GROUP IV ".
If your D has a hitch on it behind the rear bumper, you have the tow group. If there is no hitch, or the one present extends below the rear bumper cover, you don't have the tow group.
Welcome to the best Dodge Durango Forum around, where you can find a great Dodge Durango Wiki and discuss the reliability of the different trim levels including the GT and SRT!