What is the best under belly covering material for use in a mobile home application? I have rodents go under my home and tear the material covering underneath the flooring and getting up into cavity where wires and insulation, etc.
Mice hate peppermint. You could add peppermint extract to any poison you use. You can also use an electronic rodent zapper.
Spray or brush on "mouse free". Its a greasy substance that has a repentant in it. The smell repels them and its sort of sticky/greasy so they can't climb thru or on it. I have used it on my rv in the past.
A length to fit of corrugated metal will keep those mice and other critters at bay.
We have an RV. Mice will not chew through steel wool or tar paper. Stuff openings with either/both and it will keep them out.