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Hi there,
case hardened bearings would be the way to go, wheel bearings take a beating from vibration and shock due to road conditions. case hardened bearing has a hardened outer layer and a soft core which allows the bearing to absorb a lot of the shock and vibration given that it baheves like a cushion for a lack of better words. All USA domestic car manufacturers use Timken roler bearings, Timken only makes case hardened tapered roller bearings and they are also one of the best tapered roller bearing brands.
hope that helps
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