Battling rats & mice that live under the house at our hunting camp in the desert -- they win?

Rats and mice come and go from underneath our hunting property modular home. Fortunately they haven't got into the house yet. We'd like to reduce the numbers of rats and mice which will also help to reduce the number of snakes that are attracted to the area around the house. We try various methods with mostly limited success so we could use some good ideas and advice in the comments section. Your input is most appreciated!
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