I've mentioned this before, but we've had super success with a product called Mouse Free. We spray it on the areas that come in contact with the ground, (like the level up feet, tire bottoms, cords, hoses, etc.) and around any openings that are visible on the frame when looking up from the pavement. We wash it off when we clean the 5th with a power washer and then reapply. It's very easy to apply and not harmful. We also haven't had any roaches or ants either. It has a mild menthol scent. I actually spray it around a number of other things just to keep critters away.
2017 F-350 SRW 4x4 CrewCab
2017 Redwood 36RL with Goodyear 17.5 G114 and MorRyde IS, Disc Brakes
TireMinder TPMS monitor/Slide covers
Fusion backup monitor
PullRite Superglide 2900 Hitch