Lippert Bearing Inspection and Maintenance - http://lci1.com/assets/content/suppo...sheet/0132.pdf
Lippert Brake Inspeaction and Maintenance - http://lci1.com/assets/content/suppo...sheet/0133.pdf

Note that the bearings require inspection and maintenance every 12K miles or every 12 months. They do not reflect the usage of the Zerk fittings for the maintenance.