My experience is I towed a 27' travel trailer weighing in at 6,700 pounds loaded with a 2003 Chevrolet Tahoe with 3.73 gears and also had 4wd. I did not have a Hensley or anything like that but I did use weight distribution bars and 2 friction type anti sway bars. I towed with this trailer for less than a year and couldn't take it anymore. My Tahoes owners manual also stated I could tow 7,400 pounds, but it really struggled pulling my set-up safely. I had trouble getting it up to speed and keeping it up to speed on highways, and I
felt like I was not in control of my travel trailer. I was pushed around by wind gusts, and semis moderately.
I will say though when I used my set-up to tow to local campgrounds where I did not even need to get up on the highway, it did fine. It kept up to speed and I felt say towing as long as I didn't need to go over 50mph max.
I finally broke down and bought a 2500HD truck which now is night and day difference. I can actually relax while towing, and I feel safe towing to any campground I want as far away as I want.
Hope this helps!
