I would say that yes, the bearings should at least be checked - and might as well re=pack 'em.
If you want to get both bearings out to inspect them then you will probably have to pull a seal out of the inside of the hub, and that would have to be replaced, so you might want to have a couple of those on hand.
Plenty of grease! Grease is cheap, use plenty of it, don't be afraid to pack a lot of it in there. The only failed bearings I have seen were not sufficiently greased, and there is a school of thought that under-greases bearings on purpose.
And a couple new cotter pins. If the bearings are bad then you will want to replace 'em, but if not them just clean, re-pack, and re-assemble. So Either buy the bearings ahead of time, or hope for the best and go buy them if you need 'em after you have pulled the hubs.