I had one that was camping above my horizontal propane tank and occasionally found evidence on top of my slide out generator. I didn't beleive in them, but I tried one of the ultrasonic devices. My motor home is parked between a wall and my house. The wall, about mid coach has the outlet that powers the coach. I plugged the ultrasonic deivce in so that it was pointed toward the coach, about two feet away and in the middle of the coach. I haven't had issues since. I do know if it's coincidence or not.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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