If a rodent wants in nothing will keep them out. To block access, I use the light method. At night I turn on all the lights and open all the cabinet/closet doors. Then I go outside and underneath the coach and look for light. On my old coach, the rodents could enter the coach via the holes cut for the drain pipes. Was able to block the areas with steel wool and foam sealer. I think the best way to handle rodents is to use the coach a lot and keep a good supply of mouse traps.
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings