I've come to think of trailer maintenance
rather like I think of moving house. Over the years, I've come to be more skilled at doing it, but find that my dislike for it has grown.
Technology marches on. They make trailer bearings that are sealed
so well that they never need to be repacked. I have them on my Airstream, and they're great. My boat trailer
does not have them and they cannot be retrofitted without replacing the entire axle.
No one has invented trailer brakes that will work
reliably on a boat
trailer for more than a few years. Some people replace theirs every year.
Lights. Modern technology has not delivered a system of trailer lights that does not require constant troubleshooting and maintenance
. So far, I'm not having any better luck with sealed LED lights
than I am with old incandescent lights. They both fail. The LEDs fail somewhat less often, but when they do, you have to replace the entire fixture, or the pair or set or whatever if you can't find a match to your existing 10 years old ones.