GMC Repair: front wheel play - 99 4wd suburban, lower ball joints, warped rotors

Question
Hello - '99 Chevy Suburban LS 4wd 5.7L  138K

I've noticed play in the right front wheel. Can move camber about 1/4". This is the wheel bearings needing to be repacked, correct?  Possibly other issues?

2 main questions-I don't really want to do this myself, but it should be a relatively easy (quick)  job for a mechanic, right?  If he says the bearings need to be replaced, what would indicate that?  Visible pitting in races..what parts could I look at to verify he's telling the truth?  Also, do you have to replace them in pairs?

2nd thing - I can't seem to keep rotors from warping.  Are my warped rotors causing the bearing to wear?  Bearings messing up the rotors??  Have you seen rotors warping prematurely and consistently on these vehicles?  What's the most common cause?

Any help advice would be appreciated.  Thank you!
Jim

Answer
Hi
Being a 4wd, the hub/bearing are one single unit. It will be repalced as one unit. Bearing  is not replaceable separatly. Must be repalced as a single unit. In pairs - no. Only if both are giving problems. MOST COMMON problem with the hub/bearing assy is noise.
Next best guess would be upper or lower ball joints. (probablly upper).
Rotors. I would check the rear brakes for
1) leaky wheel cylinders
2) for proper adjustment.
3) Shoe life left.
4) drum diameter within specs.
and other items:
5) proper wheel torque
6) Rotor to hub mounting surface
7) LRO of rotors
Premature rotor warpage MAY caused by rear brakes not "doing their part" in the braking process.
This puts extra work load on the fronts and because of this, they warp quicker because they get hotter quicker than designed.
It also MAY be cause by improper wheel torque.
Running the wheels on with an impact gun set at full torque can cause rotor warpage. (110-120 ft lbs ONLY)
They make torque sticks for use so wheels are not overtightened.
If the surface that the rotor bolts onto (hub face) is rusted, dirty, etc.. to make an uneven mating surface, it can cause premature rotor warpage.
The LRO (lateral Runout) of rotors AFTER resurfacing. They STILL should be checked.
If the LRO is still outside of specs, it will warp QUICKLY.
I Hope all this helps.
Please follow post back, if needed.
Good Luck
Pawl