Check them out - it's a cool little contraption that protects the plug on your trailer and the pins on your truck from rust etc. Made in Canada, fits together nicely for storage, and they're red.
17' Plan A, '05 Nissan Frontier, canoe, dog.
That is cool. We had that very problem with our Casita - after sitting in 85% humidity for a couple of months there would always be some corrosion. And, of course, we'd discover it on the morning of our next camping trip!
Cheryl and Bruce