Should I leave my Travel trailer plugged in or not?

I keep mine plugged in to the 30 amp plug 24/7 if not quite 365. I keep mine plugged in through the end of December, because it's subject to be used through the end of December.

And now that I'm retired, it'll probably be used in January, to escape the winter weather here in Virginia.

Also, we just recently got back from a cross country trip. Since we've been back, we've kept the trailer plugged in since almost every two to three weeks, we have an event scheduled that calls for the use of our trailer.