Falcon 19 footer - 1986 - newbie with questions

I have an outside shower on my Horizon and didn't get a key for that either. It turns out there are only a few keys for those locks. Maybe 1/2 a dozen. I was camping once and one of my neighbors and I were talking and he used his battery box key to open my outside shower door.

I marvel how strong that ladder on the back is. I'm about 230 and it holds me just fine. I wouldn't want to jump on it, but it's pretty stout.