A 2011 with 24k miles might be too new for this idea, but it's worth a quick look regardless.
The bushings on the rear leaf spring shackles can wear, at which point the springs can slide left to right on the bushings about half an inch. When this happens, it feels like the rear axle is steering the van at random, or is being wagged around by a phantom trailer.
Take a look at where the springs are with relation to the bushings, drive a little, until you feel it acting up, and take another look. If they moved, change the shackles.
Shout out to Agile, for helping me identify this as an issue I needed to take care of a while back!
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'99 EB ex ENG KSWB news van, low rent 4x4 conversion (mostly fixed by now), home built interior.
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