A classic thing that happens in our wonderful production line RV's, regardless of brand or make, is when the guys on the line are stapling the sheeting or something onto the outside and they miss a stud. Or I will be more general, they miss a fastener going into something solid, like a stud.
When this happens, the fastener "floats" in whatever it is they were using it to attach. The fastener moves around and wiggles with movement, such as when we run down the highway with our rigs, and eventually it wears through the finish coat of siding, fiberglass or whatever material the unit is finished with. The constant wiggling of a loose fastener causes it to eventually abrade a hole in the surrounding area, resulting in the pictures you show.
I have seen this happen many times over the years.
I am not saying for sure this is what has happened in your case but it is indeed a good possibility.