Thanks for the replies. Looking at photos and videos of the Oliver it does look like a mouse would have a hard time gaining access to the camper. I just wanted to hear from folks with firsthand experience with an Oliver.
I am considering an Oliver Elite II as a retirement RV to travel the USA. I have had pop-ups and stick built travel trailers in the past and it was always a constant battle to keep mice out while the RV was in storage. How well do these Olivers do in the fight against mice?