I have my new TT is a covered storage that I have rented for 4 years. Stored 2 different truck campers there and never had any mice. Gravel bed throughout. Owner does have a quite large bate box in the corner of my 10 x 40 spot. I did put a bunch of fresh cab packets all around the inside camper a couple of months ago in new TT. Also purchased pure peppermint oil but have not used yet. Fairly mild winters here in north Dallas, TX. I will check this week when I bring camper over to the house to prep for a quick camping trip!!