I'm sorry for all the bad stuff that happened but after 3 years it's not a manufacturer issue, it's purely a maintenance thing.
The bearingz should have been repacked when the trailer was one years old (though I checked mine when they were new..) and any failure after that is the fault of who ever did the work or who ever let too much time go by before checking them again.
I don't repack mine every year but I do check them for roughness and adjustment. I also check them for heat every time I stop.
The next item you need to watch is the axle shackles. They can wear out and fail in a catastrophic manner as well.