After cleaning the bearings in solvent, visually inspect the outer races and bearing assemblies' surfaces under a good light for scoring/roughness, cracks, and discoloration. Discoloration indicates high heat, and weakened parts. Look for a color range from straw to blue.
With new bearings, I also prefer premium brands, which are packaged against dust--unlike those in open, bulk bins at RV stores.
I get dealer prices on bearings by asking the parts clerk to write it up for Dean's Garage, and telling him or her that I will pay the state sales tax.
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