I went from a Jeep Commander and a 26' TT to a Silverado and a 32' TT with the same Blue Ox SwayPro, and the difference is night and day. I would literally be panicked every time a semi passed me and wind up white-knuckling the steering wheel. By the time I got to my destination, I would have been happier to have been home. It was VERY unpleasant.
With the new TT and TV, I barely notice it anymore.
If increased TT length yields additional vulnerability to push/pull bow wave action, then in my experience a better TV more than counteracts it. I can't say if it is weight or wheelbase - I suspect the latter - but it's worlds better.