Supposable they switched from the nylon bushing most of us have had to bronze bushings which you should have so that is a big plus on your RW.
I would just pump in some new grease until all the old is out then clean up the sides and all should be good.
If any will not take grease just raise a little with the jacks and get some weight off them.
Steve
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Retired 2014 Redwood 36FL and 2015 GMC Denali 3500 DW Duramax but Now a 2020 Tiffin Allegro Bus with a 2022 GMC Canyon Denali toad.
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