I went out to the RV today and this is what I found. It seems one of the main doors has cracked.. The other door up at the front is fine but the one in the back is not. Here's a pic. What could of mad...
This looks to be the interior skin of the door... Seems it has developed some stress cracks. One possibility would be water got into the door and the temps got below freezing?? Not sure that is a possibility where you are though. I have never seen anything like this before.
Another topic with what sounds like the same issue. Clicky