I can only speak on the two I had because I haven't paid much attention to people using other brands mentioning if theirs squeak or not. I'd bet they all do at some point.
Dakar HD leaf springs: They were heavy duty. Never sagged. Took all of the abusive desert running I threw at them. But they are SO squeakin' loud on anyone's truck that has them.
@DobinsonsUSA super HD springs: Also very heavy duty. Like I said, no squeak for like 7 months and now they have a very small squeak that really doesn't get noticed.
Here is a video of 2,600 pounds of rock in my truck and the Dakar noise. They made this noise 100% of the time, even accelerating at a stop sign.
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