The bolts that connect the control arms and other suspension components should be checked often for tightness. Should a front lower mount become loose, the moment center location will change, the bumpsteer will change and the bolt will be stressed to the point of failure. It's a good idea to tack weld washers over the slotted holes in the position where you want your control arm to be mounted. If the bolt loosens, at least the arm angle will remain the same. Check these and other bolts for tightness often.