I tow a 27' TT with a ext cab truck. When i head out I always use sway control. Only takes a second to through the bar on and im good to go.
On a recent trip, we had some friends following us and when we stopped for lunch i asked them how it looked from behind and they said straight as an arrow.
After towing a PUP for 17 years and FINALLY moving up to a TT last year, sway control was one of the first questions i asked on this forum. I took the advice from the majority and bought an anti-sway bar. They're not that expensive and I love the peace of mind that comes with the fact that im doing everything in my power to tow safe, not only for me and my family, but for the others around me.
Just buy one, you wont be sorry.
This is what I use. I love it!