My manual states lube the bearings (12" wheels) every 2500 miles.
OK, I have done this after the last two trips, each in excess of 2500 miles.
Each time I tear them down, there is no evidence they need grease...they look pretty much like the last time I greased them.
On the other hand, I see boats and RV trailers ALL THE TIME on side of the road with bad hubs due to bearing neglect.
So....what is a realistic bearing lube interval on these little M/C trailers? Clearly 2500 is not a realistic number but it keeps the MFG out of trouble.