I'm wondering, could the wheels (being wider than the pickup trucks that made the ruts) be wandering into the ruts.
I've experienced this on dirt roads where the track width was wider or smaller than what I was driving.
Now if you're talking wash boarded roads, that's different.
It could be your shocks.
How much weight it's on the rear axle?
The air bags/springs may be too stiff.
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