We stayed at a park that asked for a picture before being excepted.
When we got there we saw several trailers that were covered in a green algae, torn awning fabric all around poor condition.
I guess once you get in the park you don't have to keep up the appearances anymore.
When I was driving trucks for a living, I worked for a company that had several trucks with over 3 million miles they were very well maintained. The interiors were in pretty worn out condition but mechanically they were sound.