I'm with the above posters. I have mine pulled out and the plug in stays under the trailer where it stays dry. They sell small tubes that lock over plug connections to keep them weather proof. Any hardware store (Home Depot, Lowes, Menards) should carry them. We used them all the time on job sites.
1999 Suburban 2500 4x4, 2016 Jayflight 23RB Elite, Fiberglass, Polar Package