Wheel bearings shot under 10k

[sputnik801]

'97 F350 crew cab at 292k had left wheel bearing replaced. Was humming loudly. At 304k had Power Slot rotors installed, (Love them by the way) bearings on both sides were bad and a bit noisy. Had them replaced. Now at 315k she's in the shop (DIFFERENT SHOP) for an oil leak issue and I will have the bearings done AGAIN, as they are very loud again.
Are there any things that may be causing this, other than the first shop not torquing and greasing them properly?

Unfortunately due to physical limitations I cannot do this myself. Not to mention it's cold and snowy and my truck doesn't fit in my garage!

[kanuck15]

could be torque issue. or the races arent fitting the hubs properly?

[sgg93]

Defective bearings, incorrect torque, or crooked races. Or they didn't pack the bearings correctly.

[sputnik801]

Thanks - I thought of all the above. I figured I'd ask if there was anything specific that anybody else encountered. I also thought that the race might spin in the hub.

[Big Papa 03 dually]

Make sure they check the rear end vent, if it pluged it will cause a leak someplace.
But it does sound like brg were loose.