To test for loose wheel bearings, you should:
1. Raise the vehicle off the ground using a jack and jack stands.
2. Grab the tire at the top and bottom and try to rock it back and forth.
3. If there is any movement or play in the tire, the wheel bearings may be loose and need to be inspected further.
It's important to check for loose wheel bearings as they can cause the wheel to wobble, which can lead to uneven tire wear, poor handling, and even a dangerous loss of control of the vehicle.