I often wonder if things such as the front end has issues because service people don't do the job, or more apt don't know every grease fitting to service. Boot adjustments also may be required if they become skewd due to a binding cause.
Actually because of this possible non-familiar mechanic syndrome, I have always returned to Spartan factory for all service requirements, even oil changes.
It has worked for me, just by 70,000 miles and running great.

I carry the factory service into the end which, of course includes all non-chassis service is only been done by Newmar factory. I have had little issues and therefore continue doing the same.
Peter