Have you actually pulled each wheel and repacked the bearing and visually inspected the brakes or have you simply added a couple of squirts through the zerk?
Just a couple of squirts every year....
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A couple of squirts is not adequate to completely lubricate the inner and outer bearings. The EZ Lube system first introduces grease to the inner bearing, then through displacement, to the outer bearing. So a couple squirts will at best service the inner bearing, the outer bearing will still have old grease.
I pull my drums every year. Inspect the brake pads, pay special attention to the wires that feed the magnet inside the brake drum. This is a common failure point, look for chaffing on the clips and the area where the wires might contact the hub. Clean out the old grease as best you can, inspect the bearings and the races for wear and damage, replace if damaged (I have 10k plus miles on my bearings and have never had an issue). Reinstall the drums and bearings, then re-lubricate. Re-lubrication should take numerous pumps of grease. Keep pumping grease into the bearings until you see clean grease being expelled from the outer bearing on the hub. If all is working correctly, you will have to wipe away a significant amount of dirty grease while servicing. I use at least two tubes of grease every year during my re-lube maintenance.
One note on the Zerk fittings, I had to replace all of them on my 2012 trailer. None of them would accept grease. If you have problems squirting grease into the hubs, look into replacing these fittings.
Don't be afraid to remove the hubs, it is not a big deal. Just make sure you keep everything clean, no dirt or debris in the bearings. Then lube the hell out of them, all clean grease every year.
DAN
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Taking the OB to a trailer shop on Monday, and getting the bearings re-packed and brakes inspected. (Would do it myself, but just don't have the time). For $140 it's worth it for me.
One more question, what do you do for the slides mechanisms ?