Thanks for the tips. I'll order some peppermint oil today. Two years ago I bought some granules that were supposed to deter animals from getting near my RV. It was supposed to work on pets and rodents. I spread it around under the RV and my dogs ran over and rolled in it. 15 bucks wasted.
Two years ago they got inside the RV and made a mess, so I blocked all the spaces around the plumbing with steel wool. The only time I've had problems is when the RV isn't plugged in and the ultrasonic pest repellants aren't working.
I got an e-mail a few minutes ago from the RV Repair facility telling me that they would review my complaint and adjust the bill accordingly.