^^^^I would say since you just wheel the rig and trailer it mixing up the bearings and races will be ok. Def not ideal for a street drivin rig as they won't last as many miles. The bearings wear into/with the races as time goes on. Sometimes slapping in new bearings in old races will result in not being able to preload the bearing correctly. You can usually see if a race has out lived its lifetime by a wear groove from the bearing.
When I slide it on with just the inner bearing I noticed the spindle is not centered in the hub. There is more of a gap on one side. I examine the hub well and the races seem to be pressed all the way down. I can't figure what is going wrong. I'm at a loss. Could the spindle be bent? 
