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old school bearrings should be cheked every year. add grease as needed.
the new sealed can be dry from the factory in china, they tend to only use assamble lube. so if you replace with sealed. pop them open and add grease before installing them.
as to just replacing them? miles, heat, ( air temp and brake temps) how you manouver the coach?
and yes they can get flat spots while your coach is just sitting around. ( peps that just park never move around).
all ad up to the answer.
i spend more on mantance then some do on repairs. but then i know i can just jump in and go with no worries. ( not just the rv).
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