2012 was the worst here in PA. We have the added disadvantage of owning a grey 5th wheel. It seems to attract them.
The fall does seem to be the worst for them. I think it has to do with the cutting of the corn (and maybe other crops). The things like tight spaces and the leaves on the corn stalks provide that. They start picking corn and everybody is looking for a new home.
We brought a dehydrator in from the garage to use last week. As I took it out of the box I had to round up the 2 stink bugs that came in with it.