Never lube bearings

[flasher]

These bearings need to be lubed or will fail over time,I found out the hard way,they are expensive,after that one falure I decided to replace the 5 remaining bearings,(3 axle toyhauler), I made a tool to grease them,pulled the wheels and hubs off ,grease had seeped out of the sealed bearings so they were getting dry,used the grease tool now there nice and tight

[Ray,IN]

The Nevrlube bearings are sealed, no way to determine(inspect) if they are going bad( I suppose a wobbling wheel is a hint) until they leave you on the side of the road.

The EZ-lube bearings/hubs use a grease zerk in the end of the axle stub to add grease to the hub. The problem with them is, every axle mfgr recommends visual inspection per their schedule. So, why use the zerk when the bearings must be removed, cleaned, inspected, re-packed and replaced every year?
IMO, the best bearings/hubs are wet-bath hubs, not something trailer mfgrs want to install(expense) as standard equipment.
BTW, your link shows a truck and gas MH.

[flasher]

They can be lubed with the right tool,I've done it,to change to the EZ lube the axles need to be replaced,very expressive,I grease them once a year, BTW I changed the picture, thanks