Like Hook described, the sway bar does try to minimize sway especially when the load is right over the rear axle like with a camper or other tall heavy load and there are lateral stresses like wind and turns. Even though a fiver puts a load over the rear axle, the rest of the body of the trailer and its four wheels on the ground behind the truck helps reduce the sway. But I do think the sway bar would help in some conditions like severe lateral winds, and since I use my truck for many other things like carrying loads (tall furniture, etc.) it would definitely help.
Now that Larry brings it up, how does one know they are getting the best sway bar? Starting with buying the one from the manufacturer, are there weaker or stronger ones? I'd vote for the stronger one but wouldn't know how to know this not considering the price (the highest price may not be the strongest bar, I think).
Interesting post that gets the brain juices going. I don't think they add that much weight, but the benefit could be great especially on turns or windy weather conditions which we all drive.
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