Yup, Trailertek are fine. The owner wronged me pretty badly, a few years ago, so I'll not comment on them. However, on a business level, their parts are well priced and of equal quality to most you'll find on the net. They hold a good stock too, so you should receive them pretty quickly.
Reference bearing cups/races - yes, you'll need to give them a good clout to get them moving. But once on the move they should come out ok. It's not unusual for them to crack/shatter either. If they come out intact then keep them - you can use them to start drifitng the new ones in (keeping them straight!). I've got some Snap-On parabolic drifts, which are fantastic as they're curved to fit the curvature of the bearing cups, but that's just showing off