That battery vent hole is one of their favorite entry spots, but those
suckers can go nearly flat when squeezing their way in so check all
places where wires, tubes and/or pipes traverse the cabin.  Perhaps a
grommet has deteriorated (or been eaten away) allowing ingress.

Mike
Houlton, Maine

Michael Diehr wrote:
> In addition having my van die completely, the camping itself was a
> never-ending battle between us and the mice.    Apparently, there are
> ways for small mice to get inside a van even with the doors & windows
> closed.
>
> I found one possible entry hole -- a breather tube? that goes into
> the main battery box under the passenger seat.    From there they can
> run to the driver's side battery box, and from there they have free
> run of the cabinets and closet.
>
> However, even after I blocked that off they kept finding a way in.
> Any ideas for where to look for mouse-size entry points (85 westy).
>