1995 Cavalier, 4 cylinder

We race on a dirt track with our cavalier and I know the car is not meant for that, but are problem is this: on the passenger rear side the bearings keep going out inside the spindal, last time this did this, it caused me to flip my car, because it snapped the spindal in half, is there anything we can do too make this stronger so the bearings dont wear out so fast?Is there another one that is interchangeable that is stronger? Alot of other drivers dont seem to have this problem but the cavaliers do, please respond.