Mice - Any advice on where to look for points of entry?

Mice can come in through the tiniest of holes. What I do (did this in my home), is put steel wool in some of the small crevices. Haven't had to use this the RV and hopefully won't!

Now I also have a mini-schnauzer who is excellent at ferreting these little vermin out, and he will get them and then once they stop moving it's no more fun for him....not only is he man's/woman's best friend, but he's a champ in my book!!!

Hope this helps