How many of you grease your own trailer axles?

I'd be worried about failure. Normal styles can tolerate a little misuse as long as you check them at the beginning of the season. If you lose a seal in an oil bath.....You've got nothing. I suspect that we wouldn't get the same quality set up that you'd see on a semi. I'd carry a spare hub and hope that a bad bearing wouldn't take out the spindle.......I do like the idea though.
Works on semis with the 10s of thousands of miles they put on in a year. We had a couple that both drove their Freightshaker, 100k in 4 months. There was a few others that were similar.