We have been putting white rope lights around our 5er for the past 2 years while gate guarding in Texas, leave them on 24/7 and haven't had 1 mouse inside. I don't know if it actually works, or we have just been lucky, but until we get a mouse inside the camper with the lights out, we'll keep doing it. DW loves red, so we also have some red ones that I'll put out while in a campground to keep her happy, if we are going to be there for a few days.