You'll have to provide more info and preferably a picture of the ladder and if there is another pin there for people to see. A lot of ladders don't use pins so it's hard to tell what you need.
And, your profile is incomplete so we don't know what type of RV you have.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.