Mice/rats don't like the odor of bleach. Mix some with water and spray underneath around vehicle, even dry the mice can smell the bleach, know its not food and go some place else.
If you want to spend some money for further assurances, MouseBlocker will drive them away for about $100.
I use one on my hunting trailer, not one mouse poop.
Mouse Blocker – Protecting your vehicle
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.
