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).