Agreed that the knuckle/spindle bearing could probably just be replaced as opposed to buying an entire new/used knuckle/spindle assembly.

Plus, the one you'll be getting from the Trooper will have a used bearing too.

Granted, you'd probably have to remove your current knuckle/spindle assembly anyway to have a new bearing pressed in (and thrust washer and oil seal installed), but if you're going through all that trouble of removing it anyway, ending up with a new bearing would be best as a while-you're-in-there kind of thing.