When watching a rat canvas a trailer across the road from us in Gulf Shores last summer i decided to start carrying a rodenticide bait station with us. I now place this under the camper against a tire if we will be parked longer than a weekend. I also use it in addition to the ones that the owner places at the storage building; just in case his is not tended properly. I have found a dead rat on the pavement at the storage facility. So far we have been lucky and not have one die in the camper.
http://www.syngenta-us.com/images/re...Sell_sheet.pdf