At this age and if you haven't greased em at all I would replace with a high quality bearing.
A lot easier than having a bearing seize on an axle, been there done that. Have also seen tires come off because of bearing failures.
Some of the heavy trailers I have been around have zerks just like a boat trailer. A squirt before each trip never hurts.
May just do brakes too. You're already in there, no need to make it harder than it is.
Last edited by 10gaugemag; 09/19/21.
