And then first enclosed race trailer 28' (empty) behind my 1/2-ton Suburban - that thing was swaying all over the place and just about jacknifed. Now about that thing they call a sway control LOL..
I learned to really appreciate
active sway control (Reese and Husky) during my 1,000-mile "commute" every two weeks.
That was with a Ram 2500 and a 16' enclosed trailer. Ironically the anti sway was most appreciated on the return trips, when the trailer was empty, and passing tractor trailers would make the trailer try to steer me into the tractor.
The WD hitch obviously helped plant the 2500 better (steering and stopping), and I didn't need to adjust the headlights quite as much for each trip.
Anyway, it's all simple physics, and in your case the generous overhang on the Suburban didn't exactly help. It's hard to describe how I like it to feel when towing, but basically I want the extra towed weight to be the only noticeable difference.
A good WD hitch with active anti sway goes a long way towards that goal, but is still far from perfect I think. The trailer will still affect the tow vehicle quite a bit. That's why I gave up on bumper pulls.
Gooseneck trailers are an entirely different experience. They mostly just follow nicely, with the weight being the one thing that affects the tow vehicle. Plus, they protect what's on the trailer quite well, unlike a bumper pull flatbed.