Congrats on the "new" GC. You'll find it to be a nice TV. Your empty weight idea is right, as it will be at about 6000 once you load it up, nicely under your 7400 max. But be careful on 2 things. It is easy to load up an SUV with too many required toys. Also, with only a 115" wheelbase, you should keep your TT length under about 26' total. Too easy for a tail wags dog situation otherwise.
I put an Equal-I-Zer wdh with sway control on my new setup. I had one previously and went back to what I was comfortable with. There are several good wd hitches with sway controllers that are all about the same price. I had a "chain link" hitch at one point with a brake shoe based friction bar, and never liked the setup. Maybe that was the problem - I never had it set up right.
Flagstaff 21 FBRS 2016 Jeep Grand Cherokee V6 Equal-I-Zer