How many of you do bearing maintenance or even look at them every 10 years or so? Judging from the responses here not many?
I have owned about a dozen trailers in my lifetime in all sorts of configurations and have put 10's of thousands of miles on them towing in extreme temperatures and some here would call extreme speed. I have never had a bearing fail in that time. When they are inspected they all look like brand new.
Seriously, do you people gun your TV bearings even when not towing? If not, why not?
IMHO if you have to gun you bearings at every stop your doing something very wrong or are paranoid, or both.