Is it necessary to unplug LED trailer lights when backing in the water? Thanks.

No...

i don't and everything works fine!

The older incandescent bulbs are encased in glass and are very hot to the touch. When they come in contact with the colder water they often crack due to the temperature differential. On the other hand, LEDs do not burn hot and are completely enclosed in plastic. There is no appreciable temperature differential, so there is no risk in cracking. In other words, there is no need to unplug your LED trailer lights.

No, they are cool to the touch.

I have found that they are very susceptible to flickering if you have a dirty or rusty ground connection. It's need to be cleaned every year, or else you'll have headaches. At least I did when I was trying to figure out why my lights were flickering. That's the only problem I've had with LEDs, otherwise I love them and probably won't ever use incandescent bulbs again on trailers.

Thanks guys.