Do we do trailer questions here?

My trailers do for some tlc. Got a few questions about it.

Does anyone know anything about trailer lights? Most of mine aren’t working. I popped the plastic cover off the orange one. Seems like it’s led. I assume that means when it’s burned out I just need an entire new light (as opposed to replacing a bulb)?

Also, the red tail lights, which I found online, seem to be mounted with a single rivet on the backside. Any idea how to replace these? Is it just drill out the river and swap them that way?

Lastly, there are 2 wires with stripped ends close to the e-brake box (last pic). Any idea what these might be for?

Sorry for the questions. I don’t know anything about trailer wiring and I need to research some of this stuff.

Thanks in advance.