Currently live in GA, it'll be 9 years in July. Have owned 2 RVs while living here. Never had a mouse, ant or any other critter in either RV.
They do attract Tree Frogs though. On our HTT, without fail, whenever we'd drop one of the beds, a tree frog would usually jump on someone. They never made it past the seal into the RV.
Last year on a drive to NJ a tree frog slowly crawled from behind the side view mirror on the driver's side of the Motorhome. I checked the mirror and there he was. I tried to keep him from crawling too far out, but he didn't understand.
I've never even seen a mouse while living here. We have lots of snakes, so I guess that's why. Never had a snake in either RV either.
-Michael