Originally Posted by Murphie
The rest of the trailer was pretty much what I expected. There are two holes in the front frame which I didn't know I had. This would explain how the mice got into our trailer...
Our new to us 2001 had signs of mice. I just discovered that the left side wheel well plastic assembly is hanging down about 3/8" on the inboard side. On the right side the wheel well arch assembly edge is captive between the frame tabs and the floor at each end. On the left side it looks like it was never inserted above the tabs. There are extra screws so I suspect that during assembly the wheel arch was not properly installed and when it was discovered a couple extra screws was their answer to the problem. That is a guess. Their solution probably worked for a time.
Anyway, I agree with your suggestion to crawl around underneath for an inspection once in a while. I would've thought that your 2011 would not have problems yet though. Good catch on the duct issue. Many people wouldn't have noticed. It is likely a common standard design?
Not that you asked...
I have found that electrical knockout blanks work well with a little sealant to close holes in metal. They come in some fairly large sizes and also come as oil tight units with a gasket and thumbnut. Readily available at most electrical supply houses. Here's one example in 1/2" conduit size.