2016 Chevy Suburban w Towing Package

Update: we took the trailer out for a "test drive" on Friday of last week. It was a 29' Jay Flight BH with aa weight distributing hitch. On the Yukon XL, I had t/h mode enabled, the gain for the braking configured, etc. The sway at 50mph resulting from passing tractor trailers on route 50 in Maryland was so much so that it felt like I was going to lose control of the vehicle. Since I was purchasing from a private party, I took the trailer/tow vehicle to my Chevrolet dealer, and looked the configuration with a mechanic. We loosened/tightened the weight distributing bars, and couldn't resolve the sway. I ended up returning the trailer, knowing that I had a limited window and was so uncomfortable with the configuration that I wouldn't put my family in the car.

So, I'm left pondering what's next. Perhaps the experience isn't for me. Perhaps I need a better weight distribution/sway control hitch.

Thoughts?