[wingnut60]

I had what I think was a similar problem--about a year after I got the trailer (2008, used) each time I put the kitchen slide out, there was a small amount of sawdust where the bottom of the wooden side panel sat. Did not think much on it until it was there every time--determined it to be some type of borer and had an exterminator treat. No more sawdust for over 2 years. What he used and how it was done I don't know--but it seems to have worked.
Joe