I converted my old 10' trailer to all LED. Admittedly, it didn't have as many side markers as my bigger trailer, but I don't see that would make a difference with the turn signal.
The issue with the signal operation itself is that the LEDs draw so little power. Oddly, this is why I converted in the first place...I blew my truck fuse twice. After conversion to LEDs, no problems at all.
And I believe them to be "safer". They don't burn out and the brightness of them is amazing. The turn signal and brake light operations are particularly bright...really grab your attention. Well, not YOUR attention...the dude/dude-ette behind you.
Do it to it. It'll look like a new trailer when you're done.