I wouldn't call it advice, but I'll share what I would do:
I would wait at least a year, since the bearings have neither significant time nor significant distance on them... but it would be good to jack up the trailer (one side at a time) and grab each wheel for a basic check for excessive play (lateral tilting motion), in case they were never properly seated or are wearing extraordinarily quickly. You could check wheel nut torque and brake adjustment at the same time. There is no need to remove the wheels for any of this... and there is a benefit to not messing with them if they are already properly centred and secured.
There is some possible harm in having bearings serviced much earlier than required, if the person doing the work leaves them inadequately packed or improperly adjusted. Of course, no competent professional would do that...
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