I understand your ladder itself is still in good condition, it is just the attaching hardware that is deteriorated. I had similar issue in another SOB coach and the issue was anchoring the new hardware. I cleaned/reamed out the holes and then redrilled a smaller hole to set the screws in. The attach points on ladder frame covered 90% of my handiwork which was still firm 2+ years later when we traded it in on another coach.
Bob & BJ
On the way to ournextstop