Just one question: Do you check your car/truck wheel bearings every year or 12,000 miles? I sure don't and honestly see no sense in doing it on my trailer. IMO every few years when I check the brakes works fine. Eight years, 20,000 miles and still going strong. I've read several accounts on this forum about problems that ensued after wheel bearing "maintenance". Sometimes you're better off leaving well enough alone.
Your equalizers will only wear out if you haven't already replaced the bolts with wet bolts, and decent bushed equalizers like the EZ-Flex from Dexter. They should be standard equipment.