tires and brakes on my four winds chevy 3500 chassis

Looking at rockauto.com, it hints to me that Chevy went to sealed wheel bearings for the front wheels. Be that true, I'd question the integrity of a shop which says they need packing.
For anybody lurking, on many vehicles, the brake caliper bracket prevents removal of the rotor/hub, so they pack only the outer bearing. Job should be remove, clean, pack, install with new inner seals, both inner and outer bearings.