The most interesting suggestion I've ever seen is to go into your coach at night and turn on the lights everywhere , open up all the cabinetry. Then go outside the coach, look under it, too, and look for any places where the light is shining through. Those places need to be sealed, with critterproof stuff.
We have never had critters (that I know of!) in our coaches. But I never have food in it that's not well sealed. And I keep it clean.
One time, in an abundance of caution, I had the entire coat sprayed inside and out. The pest control technician found in one of the exterior bays ( I can't remember which) an egg sac of a BROWN widow spider. It has a ball shaped egg sack with spikes all over - they look like a coronavirus molecule. The tech was so excited about his find; he caught the little 'lady' and took her egg sac to show his friends, I guess. Our coach is stored in a facility out in the country near where we live (there's no room at our house). It is covered on 3 sides, not completely enclosed.
(Yes, BROWN widow spider. I've never heard of such a thing until then. They are not as dangerous as the black widow, but I was still happy that we had it done.)
