Alan,
Nev R Lube uses a sealed cartridge type bearing very similar to modern vehicle applications. You can check for rotation feel and play Dexter does have an inspection criteria for the wheel "rock" but you cannot really take them apart and grease like traditional cup/cone hubs. They can be pressed out of the hubs and replaced.
Good to be proactive on this topic.
Gary
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S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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