Need help evaluating set up and choosing hitch hardware

The truck appears capable enough to do the job as you stated once a year for 7 hours, and would more than likely suffice with more TT towing although there will be times you wish you had a little more. An Equalizer WD/SC hitch with 1200# bars and an upgraded heavier capacity ball hitch would serve you nicely. Payload is the Achilles heel for many half tons as some do have the power/torque to accomplish the task of towing near their rated towing capacity.