I've read that any opening bigger than a nickel will allow mice to come in. We plugged those holes and haven't had any problems since (we did have some mice about 7 years ago or so, but none lately).
I also keep mouse bait inside the TM at various locations.
And there are a couple of feral cats around here, they probably help.
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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