Is a Parkliner
old enough to need new bearings?
I ask because many times the desire to "maintain" adds unreliability when service that is not needed is performed just a little "off" spec.
The EX Lube bearings just need a few shots slowly applied to them every year or so.
Travel trailers rarely get submerged launching so the bearings are just along for the ride for the most part.
As an aircraft mechanic I know that the most hazardous time to fly is right after maintenance where a good system was maintained into a non-functional one.
It is rare, but it happens.