Wheel bearings are an integral part of the wheel assembly. Heat and dirt wear the bearing assembly. As well, you have weight and stress factors to consider. Simply stated, I would replace the front wheel bearing assemblies. You have nothing to lose. After you remove the old bearings, take a look at the bearing assembly. You may see the pits and flat spots on the race. Cleanliness is the key with bearing assemblies. Clean the spindle and rotor bearing areas. When you grease pack the bearings, make sure your hands are clean as well as the high temp grease. Remount and torque to 12 ft lbs or whatever the maintenance manual recommends. Don't forget your cotter keys. This has worked for me the last 30 yrs.

Hope this is helpful.