greasing wheel bearings

Yes, according to the axle manufacturers you should do a repack every year. The other thing this lets you do is a good inspection of your brake drums and shoes. Sure it is easier to have someone else do it but its not that hard, and in fact pretty easy after the first time, and you get the peace of mind of knowing its been done to your satisfaction.

I’m no wheel bearing expert, so I’ll leave that to others. For myself, I don’t like zerks for lubing bearings, I’d be afraid of blowing out a seal and getting grease on my brakes. Also I like looking at the brakes once a year, I had a set of brake linings deteriorate and come apart in pieces.

It’s maybe 30-45 minutes a wheel to pull it and do the whole job, not rushing, not a big deal and for me worth the peace of mind.

Only one comment, they are old school drum brakes so you would be replacing drums and brake shoes. If you buy new drums new bearings and races come with it  

Having been maintaining a heavy RV for many years, I am very familiar with bearing repacking.  And I have talked to the Dexter people about it.  Their recommendation for annual repacking (or 3000 miles) is a default position.  As they explained to me, it all depends on the conditions you are towing in.  Dust, salt, lots of water are situations that might make a difference.  For the "average person",however, once every two or three years is probably sufficient.  As an owner, you can pull the drum and check things without complete disassembly.  If the grease looks good, don't bother to do as complete repack.  For the EZ-Lube axles, follow the instructions (hand grease gun while turning the wheel) to do a repack.  If instructions are followed, it's a very good system.