Our Place wrote:
Having been in the service industry for more than 30 years trailer bearings are either over serviced or never serviced. The newer axles with the grease fitting on the end of the axle are the worst offenders, too easy to stick a grease gun on that fitting and be done with it. Most bearings are over tightened, mine was on my new camper. Tight bearings generate excessive heat and cook the grease. I use Timken bearing grease and pack mine by hand and buy the best seal that is available for your axle. Properly serviced bearings will go a long time, look back at the older cars, bearings got serviced with the brakes.
Totally agree!
The fact is the aftermarket bearings unless one is brand specific are most likely poorer quality than what came on their RV.