I have to take issue with anti-sway bars being included on that list.:D
Many years ago I had a 6cyl F150 SC long bed pickup towing a 24' or so travel trailer. With the weight distribution set up, it towed the TT flawlessly. It was never bothered by wind or passing trucks. The only problem was that it was near the upper limits of the weight it was rated to tow. I decided to replace the PU with an E150 van with a V8 along with the trailer towing pkg which the F150 didn't have. The van was rated to tow considerably more than the F150. Unfortunately towing that same TT with the same towing eqpt. was a nerve wracking experience. I added a rear anti sway bar, which this E150 didn't have, despite having a "trailer towing package". That anti sway bar made all in the difference in the world with the way it handled the TT.
