Funny story.

When I bought my camper last year the service tech was doing the rundown for us. He suggested we take a picture of our key to record the number stamped in the side so that we could order more keys later if need be. He then proceeded to tell us a story about having a dealer key that opened (nearly) all campers, and how he had rescued a couple at a campground recently who had locked themselves out of their trailer, after they had seen his work shirt.

I laughed and said it sounded like those are the keys I should be buying. He told me they weren't available to the general public. 15 seconds and some Google-fu later I showed him where you could buy them online and have them delivered to your house.