Keep plenty of air fresheners throughout your camper, especially in the storage areas and the areas where hoses come through. spend the time under your RV to find gaps around plumbing or wiring.
Seal up with caulk or expanding foam ( use gloves with the foam as it doesn't come off your skin easily) Spraying the tires with ant spray sounds like a great idea too, I'll be adding a can to my tool box. To repel mice and rats use peppermint oil (organic section of your grocery store) they don't like the nice smells. Do not use mothballs inside your trailer or RV.
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