If you are talking about the EZ-lube bearings, I think the recommended interval is repacking every other year and a couple shots with a hand-operating grease gun about every 6 months if used periodically. Some will shoot enough grease until it starts shooting back out the front. I repack every 3 years since I don't use the rig as often as most, but I do the two squirts if it's been 6 months. If I haven't driven during the 6 months, then I leave things alone.
The biggest precaution is to do it slowly so you don't blow out the rear seal which will then start to grease up the brakes and you don't want that.
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