Sorry I can't help with wheel simulators but when I read your comment about the handful of gravel sound it made me think of our rig.
We have Centramatic wheel balancers and they make a similar sound when the wheel is spun.
Good luck with your simulators.
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Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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