I had mice and killed several in traps. More just kept coming in.
I got under the MH with a can of spray foam and sealed every hole I could find. If you have some big holes, some steel wool in the hole first might help.
After I sealed everything, I still had the occasional mouse. I noticed a space between the power cord and the entry hole. I made a metal shield to block this space.
I haven't had any mice since, now several years.
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